Workman HD SeriesPage 9 -- 18Hydraulic System
Problem Possible Cause
Difficulty in connecting or discon-
necting quick couplers.
Hydraulic pressure is not relieved (coupler under pressure -- engine
running).
Hydraulic lift valve is not in neutral (centered) position.
Hydraulic attachment does not func-
tion.
Quick couplers are not fully engaged.
Quick couplers are interchanged.
Oil level in transaxle is low.
Engine RPM is low.
Excessive load is applied to attachment.
Hydraulic pump drive belt is loose (Workman HD vehicles) (NOTE:
Entire hydraulic system is affected).
Gear pump key is sheared or missing (NOTE: Entire hydraulic sys-
tem is affected).
Woodruff key on drive pulley is sheared or missing (Workman HD
vehicles) (NOTE: Entire hydraulic system is affected).
Gear pump flow or pressure is low (see Gear Pump Flow and Sys-
tem Relief Pressure Test in the Testing section).
Hydraulic relief valve is stuck or damaged (see Gear Pump Flow
and System Relief Pressure Test in the Testing section).
Hydraulic lift valve is worn or damaged.
Hydraulic component(s) on attachment is malfunctioning or dama-
ged.
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