Operation and Maintenance Manual SEM636D Wheel Loader Caterpillar: Non-Confidential
Table of Contents TABLE OF CONTENTS................................................................................................................ 2 SAFETY INFORMATION .......................................................................................................... 6 SAFETY MESSAGES AND ATTACHED LOCATIONS ........................................................................ 7 GENERAL PRECAUTIONS ....................................................................................................
Foreword This manual includes guidelines on how to use this Wheel Loader safely and effectively. This manual should be kept at hand and read periodically. If this manual is lost or becomes too dirty to be legible, you should buy a new one from your dealer. If you sell the machine, make sure this manual will be handed over to the new user. This manual contains safety information, operation instructions, and lubrication and maintenance precautions.
Caterpillar: Non-Confidential
Components 5 Caterpillar: Non-Confidential
Safety Information Please read and become familiar with all of the safety information. Failure to do so may result in serious injury or death. This “Safety Information” section also contains precautions regarding options and attachments.
Safety Messages and Attached Locations There are several specific safety messages on this machine. This section introduces the exact locations of those safety messages and description of related potential risks. Please become familiar with all safety messages. Make sure that all of the safety messages are legible, clean the safety messages or replace the safety messages if you cannot read the words or illustrations. When cleaning the safety messages, use a cloth and soapy water.
Always Lock the Lockout Device When Leaving Operator's Seat Unauthorized Modification Engage the parking brake by using the lever before leaving seat, otherwise the work tools may suddenly move by bumping control levers resulting in serious injury or damage. When leaving the loader, lower the work tools completely onto the ground, engage the parking brake lever into on position, stop the engine and use key to lock all devices, then carry the key with you.
When refilling, park machine in a ventilated area, and stop the engine. Do not smoke when refilling. Tighten caps of storage containers for all the above flammable fluids. Store flammable fluids in properly marked containers, and in a specified place as per categories. Do not allow unauthorized person to use. Store oily rags and any flammable materials in protective containers, and in a secured place. Do not weld on or flame cut lines that contain flammable fluids.
by falling objects, and its protection function may be weakened. In such a case, contact your dealer for repair. Even if ROPS is installed, when operating the machine, the operator should wear the seat belt, and use other the safety devices to provide proper protection. with your hand to avoid being burned. Do not remove the engine oil temperature sensor, water temperature sensor, converter oil sensor and air conditioner water tube when the machine is hot, to avoid being burned.
gloves, and use a piece of cardboard or a sheet of wood to check for oil leakage. Even a pinhole leak can penetrate your skin causing severe injury or death. If fluid is injected into your skin, you must immediately seek treatment from a doctor that is familiar with this type of injury. Replace the parts if any of the following conditions are present: 1. Fittings are damaged or leaking. 2. Outer coverings are chafed or cut so that the steel wires are exposed. 3. Part of the hose is ballooning. 4.
After Starting Engine Check-list in order to prevent dirt from accumulating on the accelerator pedal and break pedal, and to prevent pedal replacement Check the coolant level, fuel level, and oil level in the engine oil pan, clogging of the air cleaner, and damage to the electric wiring. Adjust the operator’s seat to a position where it is easy to carry out operations, and check for wear or damage to the seat belt and mounting equipment. Change the seat belt after three years.
during operation (noise, vibration, smell, incorrect gauges, air leakage, oil leakage, etc.), move the machine immediately to safe place and look for the cause. Set the work tools to travel position. (Lift 30-40cm from level ground) When traveling, do not operate the work tool control levers. If the work tool control levers have to be operated, stop the machine first and then operate the levers. Do not operate the steering wheel suddenly.
between the machine and the electric cable. Voltage V Min. safety distance Lower 100-200 2m 7ft voltage 6,600 2m 7ft Higher 22,000 3m 10ft voltage 66,000 4m 14ft 154,000 5m 17ft 187,000 6m 20ft 275,000 7m 23ft 500,000 11m 36ft To prevent accidents, always do as follows: 1. On the jobsite where there is danger that the machine may touch the electric cables, consult the electric company before starting operations to confirm that the appropriate precautions are taken and that the work abides to regulations.
round or cylindrical objects or piled sheets, if the work tool is raised high, there is danger that the load may fall on top of the operator’s compartment and cause serious injury or damage. When handling unstable loads, be careful not to raise the work tools too high or tip the bucket back too much. If the work tools is suddenly lowered or suddenly stopped, the reaction may cause the machine to tip over. Particularly when carrying a load, be sure to operate the work tools carefully.
water, snow, or mud stuck to the wiring harness, connector, switches, or sensors, and cover these parts. If the water freezes, it will cause malfunctions of machine when it is next used, and this may lead to unexpected accidents. Carry out the pre-heat/deicing operation thoroughly. If the machine is not thoroughly warmed up before the control levers are operated, the reaction of the machine will be slow, and this may lead to unexpected accidents.
Battery and Maintenance doctor immediately. Attention: If electrolyte is swallowed inadvertently, drink large quantities of water, milk, beaten eggs or vegetable oil. Call a doctor immediately. Stop the engine before working with the engine. Avoid contacting with the metal that may cause a short circuit between positive terminal (+) and negative terminal (-). First connect the positive terminal (+) when assembling the battery.
Wear leather gloves when using a steel wire line. When doing the work together with the other workers, make sure to use signals that everyone knows before starting the work. If the machine engine cannot start or there is a failure in the brake system, please contact the Caterpillar (Qingzhou) Ltd. dealer to repair the machine. It is very dangerous to pull a machine on an incline. The worker should select an area with a small gradient.
maintaining the machine. If necessary, put warning labels around the machine. Clean Before Overhaul and Maintenance Clean machines before overhaul and maintenance. This is to prevent dirt from falling into the machine and to make sure that the maintenance can be done safely. If the machine is dirty in the course of overhaul and maintenance, it is difficult to avoid dirt or mud going into eyes or slipping and getting injured. A few tips for cleaning wheel loaders: 1.
Move the control lever to the “Center” position. when repairing or maintaining. The storage of fuel, lubricant and other combustible material should be far away from the flame. Use non-combustible material such as a solvent to wash the parts. Do not use diesel or gas because it is flammable. No smoking when repairing or maintaining equipment. Smoke in the appointed places. Use non-flammable lightening equipment when checking the fuel, lubricant or electrolyte of battery.
Maintenance by Hanging the Frame When the equipment or if the frame is hanging, use the lock bar to lock the front and rear frame, put the handlebar in the middle and wedge the equipment and frame. Move the control lever to the “Center” position. Use the blocks to stop the work tools and frame from moving. Before hanging, wedge the wheel on one side; put blocks under the machine when finished.
type and size of hose, so do not repair by yourself, contact your appointed Caterpillar (Qingzhou) Ltd. dealer. pipes may break suddenly,. In such cases the anti-fire blanket should be used to cover up. Wear a protective coat while carrying things before and after welding. Keep the welding ventilated. Clean up all flammable materials, and a fire extinguisher should be available.
onto the ground directly While handling harmful material, such as lubricant, fuel, and coolant, melting agent, filter, storage battery and other materials, obey relevant laws. Repair and Check after Maintenance Unexpected problems may occur if the proper checks and maintenance procedures are not performed. It may even damage the machine or cause injuries, and so pay attention to the following issue. Checking when the engine is off 1. Are all repair and maintenance parts checked? 2.
Avoid excessive charging; this requires the appropriate equipment and personnel for instruction. Storage of Tires Tires should be stored in a depot. People must not enter to the depot unless allowed. If tires are stored outside, it should be have barrier around tires, and hold up the sign of “NO ENTRY”. Stand the tires on the ground and fixated them with a wedge so that they will not fall down when any unauthorized person touches them.
Technical Specifications The content of this chapter has significant impact toward correct use, maintenance and service of this machine.
Application This wheel loader is a large type of construction equipment mainly used to load bulk material. Primary operations include: digging, flattening, pushing material, loading, and dragging. Working environment requirements 1. Height above sea level: ≤2000m 2. Environment temperature: －20℃～40℃ 3.
Key Technical Specifications Performance Parameters Rated Load Capacity Rated Bucket Capacity Bucket Lift Time when Full Loaded Three item time sum Maximum Travel Speed Forward Gear I Forward Gear II Forward Gear III Forward Gear IV Reverse Gear I Reverse Gear II Maximum Traction Force Maximum Bucket Breakout Force Maximum Grade ability Minimum Turning Radius Outside Bucket 3 tons 1.66 m3 4.65sec 8.34 sec 7.8 km/h 14 km/h 24.9 km/h 39 km/h 9.
Transmission Type Gear Shift Transmission pump pressure power shift spur constant mesh four forward gears, two reverse gears 1.3-1.5Mpa Main drive and final drive reduction Main drive type spiral bevel gear single-stage reduction Final drive reduction type spur cylinder gear planetary reduction Drive axle and wheel Type four-wheel drive Tire 17.5-25 Tire air pressure (front axle) 0.35Mpa Tire air pressure (rear axle) 0.
636D Arrangement Drawing Caterpillar: Non-Confidential
Operation Please carefully read and understand the manual content before you use the machine in order to correctly operate the machine. Correct operation has great significance for users to remain safe, have high working efficiency, and extend service life.
SWITCHES AND GAUGES Signal Name Function Water Temperatute Pointer showed in green area is normal,in red area is higher Temperature lamp of Gearbox oil When the temperature is lamp is lighted Work hour Clock Show the machine work hour Left Direction Lamp Caution machine to turn left Right Direction Lamp Caution machine to turn right Battery Charge Lamp When the lamp is on,the battery is charged Engine oil Pressure Lamp When the engine oil pressure is higher than 0.78Mpa or lower than 0.
Signal Name Function Dipped Headlight Lamp Dipped Headlight is on Park Brake Lamp When the park brake is open ,the lamp is lighted Warmup Lamp High Bream Lamp High Bream is on Water in Oil Warning Lamp Request to drain out the water Water Temperature Lamp When the water is higher than 104 degree and before the temperature drop to 104 degree.
Service Brake Pedal 2、Turn the switch Clock wisely to cooling position. Cooling system begin to work, send cooling air from wind-gap Heating： 1、After engine started for a while, turn the wind switch to proper wind position 2 、 Turn the switch counterclockwise to Natural Wind position. Heating system The service brake pedal is placed on the left forward side of operator’s seat. Step down on the service brake pedal and the wheel side brakes of both the front and rear axles will be engaged.
falls when pull 22 forward. The lift arm falls when you push 30 forward, the lift arm rises when you pull 30 backward. The lift arm would be at the floating situation when you push the lift arm lever forward to the extreme position. When you pull the lift arm lever back to the middle position, the lift arm would be free from that situation.
neutral position. The fuel supply and the power output of the diesel engine increase when the accelerator pedal is pressed down. Speed Control Handle The direction-speed control handle is under the steering wheel. You can control gear 1, gear 2, gear 3, gear 4, forward, reverse and the neutral position by moving the handle forward or backward. Steering Wheel You can control the forward, reverse and neutral position by moving the handle forward or backward.
Additional Accessories Lamps and Lanterns The lamps and lanterns of the machine include: the front combined lamps (left and right), the rear combined lamps (left and right), the lamps in the cab, the anti-fog lamps (left and right), the rear lamps (left and right). The front combined lamps include: the front lamps, the front small lamps and the front steering lamps. The rear-combined lamps include the rear lamps, the rear small lamps and the rear steering lamps.
it reaches one side, turn the handle to the other side in the horizontal plane, and then turn the handle in the vertical plane. There is a weight indicator beside the handle, while you turn the handle, the numerical value of the indicator will change with the movement, it shows the current rigidity of the seat. The rigidity would adapt to the operators with the weight as the numerical value.
3. Check the hydraulic oil level. 4. Check the sealing condition in the water pipe, oil pipe and other parts. 5. Check that there are no loose battery terminals, and tighten if necessary. 6. Check that the tire pressure is normal. fixing nuts of diesel engine, gear box, bolts at front and rear axle articulation. If needed tighten them. 2. Check whether the tightness of fan belt, engine belt and AC compressor belt is proper. 3. Check oil levels of the transmission, drive axle, and the diesel engine. 4.
You should release the start switch immediately if the machine cannot start. Wait more than 30 seconds to start again. This is resulted from the characteristics of the starter and the battery, if the engine does not start after three consecutive times, check out the reason. After removing the trouble, wait at least three minutes to start the engine. 13.
machine is operated at high speed, sudden complete braking is not permitted except in urgent situations. This may result in an accident or damage to the machine. teeth or bucket cutting edge insert or sit on the ground, forcing the machine to stop to ensure security. 6. Inspect the union situation of every gearshift. Drive the machine to an open and flat area; integrate every gear separately to inspect the situation of shift gears. Parking and Storage Select Location 1.
and put it in a dry garage. If it only can be put in open air, it should be put on concrete road and covered with a canvas. Fill the fuel tank and lubricate the moving pins, acting axels, and change the hydraulic oil. Put the gearshift control lever to the neutral position. Place the hand brake lever in the ‘break’ position. Put the bucket down to the ground, put the pilot valve control lever to the neutral position. Put every switch to neutral or ‘OFF’ position and lock every door.
done by using a truck. There is not a clear and level the working site and cannot be done by using a truck. Transporting by truck is not economic al when the distance is less than 500 meters. lever of bucket pilot valve backward (to turn the bucket backward), then push the bucket lever to midpoint, the machine will continue forward to insert the material pile, repeat the operation of inserting and rotating the bucket until the bucket is filled with material.
operator can release the control lever, which will not return to middle location. In this course, operator should drive the machine carefully, watching the circumstance of the bucket being close to the truck or the hopper, and turn back the operation handle at any moment. the bucket should not collide with the truck or hopper.
Towing Can transport 20 tons by towing. The method is as follows: Link to this machine’s draught pin securely. Be sure to have good performance in the brake system. Lay the bucket in transporting position. Operating slowly when start and stop the machine be careful to brake before decelerating. Notice: When braking, should brake for the tow truck firstly, and break this machine.
3. In low temperature, as the parking time is longer the battery storage capacity will decrease, so the battery should be covered or move to a warmer place, and mounted on the second day. After Cold Season As the season changes and turns warm, do the following: All components should use mid-viscosity fuel, hydraulic oil, lubricating oil. Specifications of the fuel should follow the “fluid specifications” of the Operation and Maintenance Manual.
Generally, the trailer should be the same size as the towed vehicle. Confirm the trailer has enough brake capability, weight and power to control and move two vehicles up a slope. In order to have enough control or brake capability when a towing a vehicle down slope, there should be a bigger trailer or other machine behind it to prevent rolling when out of control. The operator must steer along with the towrope direction so that the towed vehicle direction can be controlled.
Maintenance During uses this machine, please perform the maintenance according to the maintenance interval schedule and procedure specified in this manual.
Periodic Maintenance The service hour meter determines the maintenance intervals or calendar intervals (daily, weekly, monthly, etc.). Maintenance procedures are stated in this manual. Caterpillar (Qingzhou) Ltd. requested maintenance should be done either by the service hour meter or the time interval, whichever occurs first. Under extremely severe, dusty or wet operating conditions, more frequent lubrication than is specified in the maintenance intervals schedule might be necessary.
Maintenance Schedule Maintenance items Daily PM250 PM500 PM1000 PM2000 Check engine oil level √ √ √ √ √ Check coolant level √ √ √ √ √ Check hydraulic oil level √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ Check tire pressure and wear √ √ √ √ √ Check transmission oil level √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ √ Initial Check √ √ √ √ Initial Check √ √ √ √ Check fuel level, Drain the water and t
Maintenance items Daily PM250 PM500 PM1000 PM2000 √ √ Change engine oil and oil filter √ Clean engine cylinder head √ √ √ √ √ √ √ Clean radiator fins √ √ √ √ Clean filling screen of the fuel tank √ √ √ √ Clean filling screen of the engine oil tank √ √ √ √ √ √ √ √ √ √ √ √ Check the oil level of front and rear axle √ √ √ √ Check the engine air inlet system √ √ √ √ √ √ √ √ √ √ √ √ Change engine oil and oil filter √ √ √ √ Change fuel pre-filter √
Maintenance items Daily PM250 Replace the hydraulic tank return element (upper element on the oil tank) Replace the lubricating oil of the axles Initially replace pilot hydraulic system oil filter element PM500 PM1000 PM2000 √ √ √ √ √ √ Check the engine shock absorber √ Check the operation of service brake system lines and parking brake system.
with hot coolant or with steam can cause severe burns. Check the coolant level. The coolant should be located between the high-level mark and low-level mark of the radiator tank. Fill coolant to the high level mark if the coolant is below the low level mark. Check the sealing of the water radiator filler cap; change the filler cap if it is damaged. Engine Engine Coolant The proper maintenance of engine cooling system is very important.
insert the key into the ignition and turn clockwise to 1 gear position, turn on the machine power; toggle the transfer switch of the air-conditioning system to the warm position. 2. Manually turn the engine water inlet pipe valve to the ON position (when in the ON position, valve handle and the pipe are in the same direction). 3. Open the radiator filler cap, fill the coolant slowly, until the coolant level is at the high level mark of the radiator tank, and maintain the level for ten minutes.
primary filter element. 4. Clean the inside of the air filter body. 5. Clean the primary filter element with compressed air (less than 300 kPa), direct the airflow from the inside of the filter element and along its folds. Attention: When cleaning the primary filter element, do not hit it or beat it against anything, this may damage the engine. filler cap open, start engine, when coolant temperature increases to more than 80C, run the engine for another 5 minutes. 12. Stop the engine, drain out the water.
should be changed every year regardless of how many times it has been cleaned. Change the secondary filter element when changing the primary filter element. Change Air Filter Secondary Element When changing the primary filter element also change the secondary filter element. Stop the engine and then open the engine hood. 1. Remove the outer cover of the air filter. 2. Remove the primary filter element. 3. Remove the nut on the top of the secondary filter element and take out the secondary filter element.
1. If the content of sulfur in the diesel fuel Engine Oil Maintenance is lower than 0.5%, replace the engine oil Check Engine Oil Level according to the intervals specified in Periodic Maintenance section of 1. Move the machine to flat ground, stop the engine, and pull up the parking brake lever. 2. After stopping the engine, wait for ten minutes; let the engine oil completely flow back to the engine oil pan. 3.
Replace the Engine Oil Filter 1. Clean the peripheral region and the filter-mounting base. transmission to check the oil level (oil level should be on the middle of oil dipstick scale of transmission when the machine is running.) Use following steps transmission oil level: 2. Remove the oil filter with the belt wrench. 3. Clean the contact surface of the mounting base gasket with the clean cloth. If the used O-ring sticks on the mounting base, remove it. 4. Install a new O-ring. 5.
4. Fill the oil according to the transmission oil replacement method. Attention: Pay attention to cover the parking brake before replacing the transmission oil. This will prevent the parking brake friction discs from getting saturated with oil, which will reduce the braking performance. Use following steps to replace transmission oil: 1. Start the engine and leave it running for a few hours to allow the dirt, metal and sediment to float in the fluid. 2. Park the machine on a flat surface.
regularly according to the regulations of Periodic Maintenance. of front axle. Check the Axle Oil Level brake lever to release the parking brake. 1. Drive the machine on a flat field. Move the machine slowly with slight throttle to make the drain plug, located on final drive end cover of front axle, at the leveling position. So check the oil level of front and rear axle twice. 2. Place the transmission control lever at the neutral position. Engage the parking brake to prevent the machine moving. 3.
position. Engage parking brake and mount the lock pin of frame. Start the engine and run it for 10 minutes at idle speed. Repeatedly raise the boom, lower the boom, dump and rack back bucket etc. 2. Finally, raise the boom to the highest position and pull the bucket to the furthest back position. Stop the engine. 3. Push the bucket control knob of working valve forward. Dump the bucket under the gravity effect and drain the fluid of tilt cylinder.
Replace the Return Filter Element of Hydraulic Tank 1. Raise the boom and at the same time put the bucket in the rack back position. Use the support against the boom to prevent the work tool falling. Position the work tool control lever in the neutral position. Apply parking brake and stop the engine. 2. Unscrew the mounting bolts of filter cover on the side of tank and remove the cover. The cover might come off because of the spring. When taking off the bolts, the cover should be pressed down. 3.
Service brake performance Step 4: Replace it with a new friction disc. Ensure the machine’s parking brake system operate normally before checking the service brake performance in order to apply the parking brake to stop the machine in an emergency condition. The machine travels at 20km/h at the flat, straight and dry concrete road. Step on the service brake pedal to brake fully. After the machine stops, push the transmission control knob to the neutral position.
Step 4: Punch the pin lightly and tighten the retaining screw of pin. Finally, check the removed parts fully. Test the machine after confirming it’s correct. Pin and Driveshaft According to the machine lubricating maintenance figure, fill the grease on the joining point of front and rear frame, front, main, middle and rear driveshaft, oscillation frame, driveshaft support and other lubricating point until it overflows. Attention: The grease site lies on the rear end of lifting cylinder.
will not build-up or enter the nozzle. Be sure that the equipment is in good condition before use, especially the soft (hard) pipe connections, lubricate the joints and ends, and make sure they are fasted firmly. Before adding oil, first remove the air from the lubrication gun to ensure that no pressure is lost.
After the lifting cylinder pin assembly should be removed.
charge normally causing lower power. If the electrolyte of battery appears black, the engine may not start. 5. Unassembled battery if it is stored over 6 months. If the battery has low power because of the reasons mentioned above, you can recharge the power and restore it to the normal condition. (approximately 6000psi. Welding Operation When welding on the machine, to avoid machine damage or safe accident, operate according to the following regulations. 1.
the initial charging period because the specific gravity of the sulfuric acid in the battery with very low power is near that of the pure water. This causes the internal resistance of the battery to be very high. At this time, reduce the charging current or change to a higher power charger. As the charging process is completed, the specific gravity of the sulfuric acid in the battery increases and the charging current returns to normal slowly. 5.
Fluid Specification Use the following regulated specification and varieties to ensure the machine normally operate when adding and replacing the different kinds of oil. Component Used Ambient Temp.
Maintenance 2. If the machine works in a cold area for long time, HV46 low-temperature Anti-wear hydraulic oil must be used. 3. Change the oil on time. Even if the oil is clean, it may decrease in performance after a long time of storage. 4. Choose the fuel according to the lowest local temperature of environment.
Failure Causes and Repair Review common machine symptoms and related troubleshooting techniques for use by customers and servicemen.
Engine system Refer to the engine manual for specific troubleshooting details. Transmission Transmission oil pressure is too low in every gear Problem 1. Transmission oil level is too low Solution 1. Fill transmission oil level to the proper level 2. Oil leakage in main pipe lines 2. Check and repair 3. Transmission oil suction filter screen is 3. Clean or replace the filter screen blocked 4. Transmission oil pump is damaged 4. Repair or replace the pump 5. Improper pressure valve adjustment 5.
Insufficient machine power to drive the machine 1. Low transmission oil pressure 1. See (Transmission oil pressure is too low in every gear) and (Transmission oil pressure is too low in some gears) 2. Torque converter oil temperature is too 2. See (Torque converter oil temperature is high too high) 3. Damaged torque converter impeller 3. Disassemble and check the torque blades converter, replace the damaged blades 4. Insufficient output power from the engine 4.
Rapid air storage tank pressure loss after the machine is parked 1. Brake inlet valve is blocked or damaged 1. Brake continuously several times to remove dirt, or replace with a new valve 2. Pipe connectors are loose or lines are 2. Tighten the connectors or replace the damaged lines 3. Relief valve is not sealed 3. Investigate and replace the valve if necessary Slow pressure rise after the engine is started 1. Abnormal working condition of the air 1.
Voiding of hydraulic oil in suction line or foaming of hydraulic oil 1. Hydraulic oil level is too low 1. Fill oil to the required level 2. Filter is blocked 2. Clean the filter 3. Damaged oil pump 3. Repair or replace the pump 4. Air leakage in oil suction lines or 4. Repair or replace the damaged parts damaged pump seals 5. Contaminated and/or deteriorated 5. Replace hydraulic oil with recommended new hydraulic oil Hydraulic oil temperature is too high 1.
Foam in the oil, abnormal sound coming from the oil, oil cylinders sometimes move and stop while the steering wheel is being turned 1. Air in the system 1. Check oil level and add oil to the required level. Check whether there is air leakage in the suction oil and resolve venting the air out of the system Easy steering without load, heavy steering with load 1. Setting of the steering safety valve 1. Re-adjust the steering safety pressure lower than the operation pressure pressure setting 2.
Electric System Generator does not generate electricity, or the voltage is low 1. Drive belt is slipping 1. Adjust the belt 2. Connector contains oily dirt or is worn 2. Clean the oily dirt off using a clean cloth moistened with gasoline or grind it using fine abrasive paper 3. Bad contact between electric brush and 3. Check and repair connector 4. Excitation coil is open circuit 4. Inspect the outer magnetic field and check the excitation loop with a light bulb 5. Residual magnetism disappears 5.
4. Compressor does not work. When the 4. Repair or replace with the compressor engine speed varies, only slight changes are valve plate observed between low and high-pressure readings 5. Cooling system lines are broken, or 5. Repair cooling system lines, inspect refrigerant is leaking, Low and high pressure system for leakage, evacuate lines, and fill readings are zero with Freon 6. Dryer of the receiver or expansion valve is 6.
Increasing noise 1. Drive belt is loose or worn 1. Tighten belt or replace with a new belt 2. Compressor is loose on its mounting 2. Tighten bracket mounting screws bracket 3. Blower motor is loose or worn 3. Repair or replace the motor 4. Slip of the electromagnetic clutch is 4. Disassemble, repair or replace resulting in noise 5. Inner parts of the compressor are worn 5.
