Gradall 534B (9020-7317) Service Manual - Manual (Page 131)

The function of the CM Assembly is to supply a
continuous regulated 6 volt supply to the F/R Pilot
Pressure Control Valve. The assembly includes a 5
amp manual reset breaker.
The CM Assembly must be removed from the
Materials Handler for testing.
A Volt/Ohm Meter and two test leads are needed to
test this unit.
1.
GRADALL
LOED MATERIALS HANDLER
534B
TESTING AND ADJUSTING
HOW TO TEST THE CM ASSEMBLY
(UNDER DASHBOARD)
2.
If these values cannot be achieved, replace the CM
Assembly.
The 5 amp circuit breaker protects the rear drive
electrics. If you have an electrical problem and this
circuit breaker is not affected, then the problem is
not in the rear drive electrics.
To test the Circuit Breaker, connect the leads on
the Ohm meter to terminals 4 and 26 in the CM
Assembly. The meter should read 0 with the
breaker button set to the “IN-OFF” position.
It should read “infinity” in the “OUT-ON”
position.
To test regulator, connect a test lead from the
negative post of a 12 volt battery to terminal
“G”. Also connect a test lead from the positive
post of the battery to terminal 13. Using the volt
meter, measure the voltage between terminal “G”
ground and terminal 24. The meter should read 6
volts.
Move test lead from terminal 13 to terminal 14.
Measure the voltage between terminal “G” and
24 again. It should read 6 volts.
11
CM Assembly
FROM
FRAME HARNESS