Tennant 242E, Operator'S Manual

Page: 54 / 92

MAINTENANCE
242E MM243 (5---92)
3-14
HYDRAULIC COMPONENTS TROUBLESHOOTING
PROBLEM CAUSE REMEDY
Hydraulic pump making
excessive noise.
Partially clogged pump inlet line. Check the inlet line to pump and tank
inlet. If oil is dirty, drain system and
flush thoroughly. Refill with new,
approved hydraulic fluid.
Air leak at pump intake line
connections.
Pour fluid on connections to check for
leaks --- listen for change in pump
sound level. Tighten connections
which are loose.
Air bubbles in hydraulic fluid. Check for low hydraulic fluid or loose
connections in hydraulic lines.
Hydraulic pump is worn or damaged. Repair or replace pump.
Hydraulic motor operates
slowly.
Worn pump. Repair or replace pump.
slowly.
Worn hydraulic motor. Replace seals and repair motor.
High hydraulic fluid temperature. Change to higher viscosity fluid.
Clogged hydraulic fluid filter. Change filter element or cartridge.
Hydraulic motor will not turn
over.
Shaft seized in housing. Replace housing and shaft assembly.
over.
Large contaminating particles in
hydraulic fluid.
Flush out system, change fluid and
fluid filter.
Broken shaft. Replace shaft.
Hydraulic motor runs without
turning the shaft.
Broken parts in motor. Disassemble motor and check parts.
Hydraulic motor leaks at
shaft.
Worn or cut shaft seal. Replace shaft seal. Polish shaft at
seal area --- check for rough areas or
burrs.
Leak between flange and
housing in hydraulic motor.
Loose flange screws. Tighten screw.
housing in hydraulic motor.
O-Ring worn or damaged. Replace o-ring.
Housing plug o-ring leaking. (Side
brush motor only.)
Replace plug o-ring.
Leak between housing and
plate or plate and gerotor in
End cap screws loose. Tighten end cap screws.
plate or plate and gerotor in
hydraulic motor.
O-Ring worn or damaged. Replace o-ring.
Leak between gerotor and
end cap.
Dirt between surfaces. Disassemble, clean parts.
end cap.
Scratches, nicks, burrs Polish parts.
O-Ring worn or damaged. Replace o-rings.