Use and Care Manual

6. Bleed the hydraulic system. See section Bleeding the Hydraulic System.

Bleeding the Hydraulic System

Overview

Bleeding trapped air from the hydraulic system is necessary each time the drive system or

hydraulic system is opened up. Trapped air bubbles can cause equipment malfunctions or

erratic performance.

Procedure

Follow the procedure below to bleed trapped air from the exciter circuit and the drive

circuit.

1. Fill the hydraulic system with clean hydraulic oil until it is visible at the middle level or

higher in the sightglass. Do not re-use used hydraulic oil.

2. Disconnect the wire located on the fuel solenoid.

3. Crank the engine 5–10 seconds. This will allow the oil to fill the inlet lines.

4. Reconnect the fuel solenoid wire.

5. Place forward/reverse control in the NEUTRAL position. Start the engine and run the

machine at idle for 3–4 minutes.

6. To bleed air from the exciter circuit,

a.Select Single Drum Vibration mode and turn the vibration on.

b.Run the machine for 3–4 minutes.

c. Turn the vibration off, and switch to dual drum vibration mode.

d. While still at idle, turn vibration on again and run for 3–4 minutes in dual drum vibration

mode.

e.Turn vibration off, increase engine speed to full, and turn vibration on.

f. Verify hydraulic oil level and add oil as needed.

7. To bleed air from the drive circuit,

a. Slowly move the travel control lever back and forth, from forward to reverse, for a short

time.

b. Switch the engine to high idle for 15–20 seconds. Return the engine to low idle for 1

minute. Repeat this process 2–-3 times. to bleed the remaining air from the hydraulic lines.

c. Check the hydraulic oil level and add oil as required.

NOTICE: If the drive pump chatters or operation is noisy, turn the

machine off and check for air leaks in the inlet line of the charge pump.