Snorkel A38E Parts And Service Manual page 139

P
ROBLEM
Platform assembly will not
slew
Platform assembly will not
descend
Machine will not steer
Machine will not drive
A38E Work Platform
Troubleshooting
C
AUSE
1. Faulty controller
2. Faulty slew solenoid
3. Incorrect cross-line relief
setting
4. Faulty slew select switch
1. Faulty controller
2. Faulty mast or jib solenoids
1. Malfunction of joystick toggle Check I/O's using EZcal diagnostics.
switch
2. Faulty steering solenoid &
valve
3. Faulty controller
4. Steer cylinder malfunction
5. Seized wheel mounting frame
pivot(s)
6. Damaged steering link plates Replace the steering link plates, associated pins and lock plates.
1. Temp
2. Towing valve open
3. Incorrect hose connections
4. Fail-safe brake-circuit
malfunction
Check the I/O's Using EZcal diagnostics
Check voltage at the solenoid electrical connections.
Use a screw driver or similar component to check the magnetic effect
of solenoid.
Insert a pressure gauge in the TP port of the valve block.
Operate a slew function and measure the pressure.
Provided the main relief pressure has been preset properly, the gauge
should register 20-50 bar.
Reset or replace CLRV valves thus preventing bypassing of oil.
Replace the complete switch assembly.
Check the I/O's using EZcal diagnostics.
Check the programmed mast speed settings.
Check the continuity of mast speed enabling cables to the
controller.
Repair as necessary.
Check the voltage to the solenoids V7 & V8 for the mast functions.
Swap solenoids to confirm fault and replace if necessary.
Remove and service the switch &/or joystick.
Check that the solenoids at V5 are energised while the steering
Check the cables feeding these solenoids. Replace the solenoids if
necessary. Check the valve cartridges for contamination.
C h e k c / I O s ' u s n i g E Z c l a d
steer speed enabling cable to the controller. Repair or replace as
necessary.
Check the hose connections to the cylinder.
Check the cylinder rod-end pins and the cylinder mounting bolts.
Refer to the maintenance section for assembly and repair of the pivot
and associated parts.
Reset system and allow the system to cool down.
Locate the towing valve CT 21
closed by turning clockwise.
Refer to the hydraulic diagram for correct connections of valve ports
to the motor ports. Incorrect connection may result in locking of
wheels.
Blocked brake line to either motor. Clear blockage and/or replace
hoses and fittings.
Check the correct function of the check valves V1 and V2 on
the valve block. These valve should open to allow brake chamber
evacuation.
A
CTION
a i g n o s c i t . s C . h e k c h t e c o t n n i
on the valve block. Ensure that it is fully
Section
5.1
u y t i f o h t e
5-5