Gradall 534B (9103-1390) Service Manual - Manual (Page 100)

PROBLEM PROBABLE CAUSE REMEDY
Loose or broken wire at cutoff
switch operated by brake lever .................... Repair
Loose or broken wire at cutoff
solenoid ............................................... Repair
Defective cutoff switch ............................. Check wiring, or replace pressure switch
Low pilot pressure .................................. Reset - 350 psi
Defective cutoff solenoid ........................... Repair, check wiring. Replace.
Not supposed to be able to ..........................
Controller stuck ..................................... Check wiring, check operation of valve.
Check all linkage.
Inching valve not operated by foot ............. . Check all linkage from brake pedal to all
movement ......................................... . switches. Make adjustments in linkage as
necessary.
PROBLEM PROBABLE CAUSE REMEDY
Wires crossed at series/parallel
valve solenoids.
.................................... Repair
Wires crossed at first and second
pressure switches
.................................. Repair
ENGINE STALLS
WHEN TRYING TO STOP MACHINE
PROBLEM PROBABLE CAUSE REMEDY
Spool stuck in controller ........................... ..Repair
Inching valve linkage failed ........................ . . Replace. Check linkage on pedal l to switches
Check wiring to switches if O.K.
Replace switch.
Check spools for free shifting. Repair
REAR WHEELS HAVE MORE EFFORT
IN SECOND THAN FIRST
POOR INCHING
4
SIGNAL OR
PRESSURE TO
KICK OUT
TRANSMISSION
IN THIRD
GEAR ONLY
SERIES PARALLEL
CIRCUIT REVERSED
CONTROLLER NOT
BEING MOVED TO
CENTER BY FOOT
IN FIRST AND
SECOND GEAR
CONTROLLER NOT
BEING ACTUATED
BY FOOT MOVEMENT
.
TRANSMISSION
OUT BUT NO “FEEL”
SPOOL IN
CONTROLLER
STUCK AND SPOOL
IN SERIES/PARALLEL
STUCK IN THIRD
GEAR ONLY
FIRST, SECOND &
THIRD, SAME AS
ABOVE, BUT FIRST
OR SECOND PRESSURE
SWITCH STUCK ON
ALSO