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1235 HYDRAULIC TROUBLE SHOOTING GUIDE
PROBLEM #1 Unit comes down to fast when key is turned to down cycle.
SOLUTION: Turn in slightly knob on flow control valve located at back end of large mast cylinder.
PROBLEM #2 Unit goes up on casters as unit is coming down.
SOLUTION: An adjustment balance between the flow control and needle valves. Located at the rear of each cylinder.
Readjust each valve slightly until operation is obtained. (Caster cylinder will start to extend on down cycle
until casters do put some pressure on the floor but should not lift entire base off the floor until mast is all
the way down.)
PROBLEM #3 A) Unit will not come down off casters.
B) Unit will not go up on casters.
C) Boom and mast will not come down.
D) Boom and mast will not go up.
SOLUTION: Check to see if someone has turned in the knob on either or both of the control valves. Open slowly.
Readjust per Problem #2.
PROBLEM #4 A) When unit is up on casters but starts to lower itself.
B) When front mast and boom are up but starts to come down. (Also, when T-handle is loosened, mast
comes back.)
SOLUTION: Check and tighten any loose fittings. If no loose fitting are found it maybe an internal leak in a valve or
cylinder. Call a hydraulic serviceman.
IMPORTANT
FILE THIS ASSEMBLY, ADJUSTMENT, OPERATION AND MAINTENANCE BOOKLET IN A SAFE LOCATION FOR
FUTURE REFERENCE, TO AVOID INJURIES OR PRODUCT DAMAGE WHEN REPLACING A BACKBOARD, OR
PERFORMING OTHER NECESSARY MAINTENANCE.
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