Page 116
45-J Desel - Servce & Parts Manual
January 2022
Secton 19 - Troubleshootng
Problem
Possible Cause
Remedy/Solution
Drive
No drive operation
Drive Valve (on drive pump) not
energized
Check Drive output from VCCM Module VP5 and VP6.
Check for power at valve coils located on top of the drive pump.
Drive Valve (on drive pump) not
shifting
Check drive valve for contamination
Brakes not releasing (system under
pressure when drive attempted)
Check brake valve and brake pressure. See hydraulic diagram for
location.
Drive joystick output failure
Check drive joystick output from GP400 (see 2d2, P10-1) check joystick
enable trigger operation, Check wire connections.
Low pump stand-by pressure
Check at main manifold port GCP (see hydraulic Diagram).
Adjust stand-by pressure to 300 PSI (21 bar).
Incorrectly adjusted or worn
hydraulic drive pump
See Section 10 - Hydraulic System for pump adjustment. Inspect or
replace pump.
No drive with platform
elevated
Unit out of level
Lower boom and operate on more level surfaces.
FWD MIN, REV MIN setting
incorrect
Reset drive speeds using EZ-Cal
Hydraulic oil incorrect for severe
low temperatures
Use hydraulic tank warmer if equipped. Operate drive continuously until
drive begins to operate.
Low pump stand-by pressure
Check at main manifold port GCP (see hydraulic Diagram).
Adjust stand-by pressure to 300 PSI (21 bar).
System interlock
Check EZ-Cal HELP messages for interlock
**CE rated models
Axles not parallel
Reposition machine on flat ground
Slow drive with platform in
stowed position and boom
retracted
Slow speed enabled
Check speed switch in platform box. Check 2-speed valve located on the
main manifold (see hydraulic diagram).
Hydraulic oil incorrect for severe
low temperatures
Use hydraulic tank warmer if equipped. Operate drive continuously until
drive begins to operate.
Boom Retract proximity switch
failure
Check for power ground & signal output to Proximity Switch located inside
the rear of boom. Also check EZ-Cal 2C1, P14-10 for input.
Low pump stand-by pressure
Check at main manifold port GCP (see hydraulic Diagram).
Adjust stand-by pressure to 300 PSI (21 bar).
FWD MAX, REV MAX setting
incorrect
Reset drive speeds using EZ-Cal
Wheel motor not functioning
correctly
Inspect wheel motors for damage or wear.
Poor grade-ability or drive
performance
High Speed enabled
Check Speed Switch
Wheel motor not functioning
correctly
Inspect wheel motors for excessive bypass or shift not working properly
Hydraulic oil incorrect for severe
low temperatures
Use hydraulic tank warmer if equipped. Operate drive continuously until
drive begins to operate.
Planetary hub bypass engaged
Check bypass plates located in the center of each planetary hub. Should
be convex. Turn over if not.
Low pump stand-by pressure
Check at Brake/Axle manifold, should be 300psi (21 bar).
Adjust stand-by pressure to 300 PSI (21 bar).
Incorrectly adjusted or worn
hydraulic drive pump
See Section 10 - Hydraulic System for pump adjustment. Inspect or
replace pump.
Drive in one direction only
Drive valve not energizing in one
direction
Check 12 volts to coil. Check coil. Check valve function (located on top of
drive pump).
No output from VCCM Module
Check output from VCCM VP5 and VP6
Drive joystick output failure
Check drive joystick output from GP400 (see 2d2, P10-1)
No High Speed
Speed selector switch inoperative
Check continuity through speed select switch with wires disconnected
2-speed valve SV9 not functioning
Check for 12 volts and ground to valve. Check for faulty valve spool.
Check switch position output from GP400 (See EZ-Cal ID# 2E1, P5-9).
Boom Retract proximity switch
failure
Check for power ground & signal output to Proximity Switch located inside
the rear of boom. Also check EZ-Cal 2C1, P14-10 for input
Содержание 45-J Diesel
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