Service Manual

Problem Possible Causes
Difficulty in connecting or disconnecting quick Pressure not relieved (coupler under pressure –
en-
couplers. gine running).
Remote hydraulic valve not in float position.
Attachment does not function. Quick couplers not fully engaged.
Quick couplers are interchanged.
Pump drive belt loose.
Sheared key on pump shaft.
Hydraulic oil level low.
Low engine RPM.
Excessive load.
Low pump flow or pressure – TEST NO. 1.
Remote hydraulics relief valve stuck open damaged
– TEST NO. 2.
Remote hydraulic valve worn or damaged.
Hydraulic component(s) on attachment malfunction-
ing or damaged.
Box drops from raised position with lift valve in cen- Improperly positioned valve.
tered position.
Dump valve worn or damaged.
Internal leakage of lift cylinder(s).
Lift cylinder hydraulic lines or fittings leaking.
Power steering hard. Remote valve not in neutral or float position or
Remote hydraulic valve linkage out of adjustment.
Pump drive belt loose. NOTE: A loose pump drive
belt will also cause the box not to lift or other attach-
ment to not operate.
Low engine RPM.
Hydraulic oil level low.
Hydraulic oil overheated.
Low pump flow or pressure – TEST NO. 1.
NOTE: Low pump flow or pressure will also cause
the box not to lift or other attachment to not operate.
Power steering gear worn or damaged.
Workman 3000/4000 Series Page 9
– 11 Hydraulic System
Hydraulic
System)