User Manual
Table Of Contents
- Safety
- Applies To
- Using this Manual
- Safety Alerts
- Illustrations
- General Safety Instructions
- Data Recorder
- Environmental Protection Agency
- Repairs
- Additional Sources of Information
- Cab Access
- Deckplate Access
- How to Open the Hood
- Close the Hood
- Seat
- Vehicle Loading
- Visual inspection while approaching the vehicle
- Daily Checks
- Weekly Checks
- Systems Check
- Emergency
- Controls
- Instrument Panel
- Gauges
- Warning Lights and Indicators
- Warning Lights
- Introduction
- Anti-Lock Brake System (ABS)
- Anti-Lock Brake System (ABS), Trailer
- Axle, Stability Control (Option)
- Axle, Traction Control
- Check Transmission
- Diesel Particulate Filter (DPF) Warning Light
- Differential, Inter-Axle Lock
- Dump Truck, Body Up
- Dump Truck, Trailer Body Up
- Engine BrakeSaver or Transmission Retarder
- Engine, Brake ON/OFF
- Engine, Brake Level
- Engine, Check Engine
- Engine, Engine Block Heater
- Engine, Low Coolant Level
- Engine, Overspeed
- Engine, Retarder (Brake)
- Engine, Stop Engine
- Engine, Wait To Start
- Emissions, Engine Derate
- Emissions, High Exhaust System Temperature
- Fifth Wheel Locked
- Fifth Wheel Unlocked
- Fifth Wheel Slide Unlocked
- Hill Hold (Eaton Ultrashift Plus)
- Lane Departure Warning (LDW)
- Lights, High Beam
- Malfunction Indicator Lamp (MIL)
- Message Waiting
- Park Brake
- Seat Belt, Fasten
- Transmission, Oil Temperature High
- Turn Signal, Left
- Turn Signal, Right
- Worn brake
- Menu Control Switch
- Steering Wheel Controls (Option)
- Exterior Lights Switch (ELS)
- Peterbilt Digital Display
- Display Notifications
- Views
- Menu
- Post Trip
- Dash Switches
- Axle, Automatic Traction Control
- Axle, Diff-Lock - Dual
- Axle, Diff-Lock - Forward Rear
- Axle, Diff-Lock - Steer
- Axle, Diff-Lock - Rear Rear
- Axle, Diff-Lock - Single Rear
- Axle, Inter-Axle Differential Locked (Tandem)
- Axle, Two Speed
- Back Up Alarm Mute
- Batteries, Low Voltage Disconnect (LVD)
- Brakes, ABS Off-Road
- Brakes, Parking Brake Valve
- Brake, Trailer Hand
- Cab and Panel Dimmer Switch
- Dump Truck Gate
- Engine, Brake Level
- Engine, Brake On/Off
- Engine, Cruise Control On/Off
- Engine, Cruise Control Set/Resume
- Engine Fan Override
- Engine, Heater
- Engine, Remote Throttle
- Engine, Shutdown
- Exhaust, Brake On/Off
- Exhaust, Diesel Particulate Filter (DPF) Regeneration
- Fifth Wheel Slide
- Fuel Heater
- Generic Air, Accessory
- Generic, Spare SPARE
- Kingpin Release
- Lane Departure Warning Disable
- Ignition Key Switch
- Lights, Beacon
- Lights, Daytime Running (Override)
- Lights, Flood
- Lights, Flood ISO 3732 Spare
- Lights, Fog
- Lights, Footwell (option)
- Lights, Hazard
- Lights, Spot
- Pintle Hook
- Power Take-off (PTO)
- Suspension, Air Retention
- Suspension, Axle, Pusher
- Suspension, Axle, Tag
- Suspension, Lift
- Suspension, Third Axle Lift
- Trailer Air Supply
- Trailer, Axle (3rd Axle) Lift
- Trailer, Axle Lift Forward
- Trailer, Axle Lift Rear
- Trailer, Belly Dump
- Trailer Dump Gate
- Trailer, Belly Dump Gate Center
- Trailer, Belly Dump Gate Front
- Trailer, Belly Dump Gate Rear
- Trailer, Hotline
- Trailer, Suspension Air Dump
- Winch Clutch
- Steering Column Controls
- Door Mounted Mirror Controls
- Ignition Key Switch
- Exterior Lighting Self-Test (ELST)
- Heating and Air Conditioning
- Cab Accessories
- Driving
- Starting and Operating
- Starting and Warming Up
- Engine Operations
- Transmission
- Hydraulic Brakes
- Air Brake System (option)
- Brake Safety and Emergency
- Retarders
- Axle and Suspension
- Fifth Wheel
- Driving Tips and Techniques
- Stopping the Vehicle
- Antilock Brake Systems (ABS)
- Maintenance
- New Vehicle Maintenance Schedule
- First Day
- First 50-100 mi / 80-160 km
- First 500 mi / 800 km
- First 2,000 mi / 3,218 km
- First 3,000-5,000 mi / 4,800-8,000 km
- Preventive Maintenance Intervals
- Fender Liners
- Lubricants
- Air System
- Dual Air System Function Test
- Air Dryer Maintenance
- Air Tanks
- Air Gauges and Air Leaks
- Air Compressor
- Brake System
- Cab Maintenance
- Safety Restraint System - Inspection
- Cooling System Maintenance
- Windshield Wiper/Washer
- Electrical System
- Engine Aftertreatment System Power Requirements
- Low Voltage Disconnect (LVD) (option)
- LVD Setup
- Fuses, Circuit Breakers and Relays
- Adding Electrical Options
- Maximum Number of Lamps Allowed per Circuit
- Vehicle CAN Bus
- Batteries
- Under Cab Battery Access
- In Cab Battery Access
- Cranking Battery Specification
- Removing Batteries
- Installing Batteries
- Replace Battery Box Cover
- Slow Battery Charging
- Alternator
- Remote Keyless Entry
- Engine Maintenance
- Fuel System
- Frame
- Front Axle and Suspension
- Heater and Air Conditioner Maintenance
- Noise and Emission Control
- Diesel Exhaust Fluid Tank
- Rear Axle and Suspension
- Rear Axle Alignment
- Steering System
- Driveline
- Tires
- Wheels
- Transmission Maintenance
- Hydraulic Clutch
- Specification Reference Charts
- Information
- Glossary
- Index
Inter-Axle Differential Lock
Operation
NOTE
Do not use the differential lock during
downhill
operation or at speeds above
25 mph (40 km/h). When it is engaged
under these conditions, your vehicle
will exhibit understeer handling char-
acteristics. This understeer condition
will cause your vehicle to not turn as
quickly and more steering effort will be
required, which can cause an acci-
dent. Failure to comply may result in
property damage, personal injury, or
death.
Understeer Condition
1. Turning Radius When Unlocked
(Disengaged)
2.
Turning Radius When Locked
(Engaged)
To LOCK the Inter-Axle Differential
1.
Anticipate when you might need
increased traction, slow down to a
steady speed under 25 mph (40
km/h) or stop the vehicle. Do not
lock the differential while going
down steep grades or traveling
faster than 25 mph (40 km/h), or
while wheels are spinning or
traction is minimal; lock the
differential before you encounter
these conditions.
2. Put the inter-axle differential lock
switch in the LOCK position. A light
on the switch will turn on, indicating
that the differential is locked
(engaged).
3. If you LOCK or UNLOCK the
differential while moving, let up
momentarily on the accelerator
pedal to relieve torque on the
gearing and allow full engagement
of the clutch (mechanism that locks
the wheels).
NOTE
The Meritor main differential lock or
Dana
Spicer wheel differential lock is
controlled by the switch labeled
WHEEL DIFFERENTIAL. By moving
the
switch you can LOCK or UNLOCK
the main differential when the vehicle
is moving or stopped.
NOTE
If your vehicle has an automatic trans-
mission,
it may be necessary to shift
the transmission to the Neutral posi-
tion momentarily to allow the main dif-
ferential lock splines to fully engage or
disengage.
4. Drive the vehicle through the poor
traction area, keeping your speed
under 25 mph (40 km/h).
T
o UNLOCK the Inter-Axle
Differential
1. When you reach dry pavement or
better road conditions where the
differential lock is not needed,
switch the differential lock to
UNLOCK.
2. Let up momentarily on the
accelerator pedal to relieve torque
and allow the clutch to disengage.
3. When you unlock the differential,
normal vehicle handling will
DRIVING - Axle and Suspension
148 Y53-6113-1A1 (11/20)
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