Tennant 285, Operator'S Manual

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MAINTENANCE
285 MM191 (12---89)
3-18
HYDRAULIC COMPONENTS TROUBLESHOOTING
Problem Cause Remedy
Hydraulic cylinder failure Piston seals leaking Install seal kit
Barrel worn or rod bent Replace cylinder
Hydraulic control valve Valve seals leaking Install seal kit
failure Relief valve stuck open Clean or replace relief valve
(leaking) cartridge
Solenoid valve failure Valve leaking Install seal kit
Solenoid failure Replace solenoid coil
Solenoid spool sticking Replace valve cartridge
Relief valve stuck Clean or replace relief
open (leaking) valve cartridge
Hydraulic motor failure Motor leaking Install seal kit
Drive link failure Replace drive link
Gerotor worn Replace gerotor set
Output shaft failure Replace output shaft and
bearings
Hydraulic gear pump Pump leaking Install seal kit
failure Gear set failure Replace gear set
Shaft failure Replace gear set
Flow divider failure Replace back plate assembly
Engine-to-pump coupling Replace coupling
failure
Hydraulic piston pump Pump leaking Install seal kit
failure Relief valve stuck Clean or replace relief valve
Integral charge pump failure Replace charge pump
Rotating group worn Replace rotating group
Shaft failure Replace shaft
Backplate worn Replace backplate
Engine-to-pump coupling Replace coupling
failure