Edition
Manual
Chapter
Page
2008-10-23 Workshop Manual, Stiga Titan 4 Hydraulic system
31
4.6 Trouble shooting
Warning!
Hydraulic oil under pressure can be
very dangerous if hoses, lines or other
distribution parts are leaking. To avoid
personal injuríes, always wear protec-
tion gloves and protection goggles
during works with the hydraulic sys-
tem.
4.6.1 Drive system
Before the trouble shooting takes place, it is
provided that the following states are fulfilled:
• The by-pass valve is in the drive position, out-
wards. See the figure.
• Oil level in the oil container as desired.
• No air in the hydraulic oil.
• The oil shall not be contaminated, change oil
if neccesary.
Symptom
Fault
Measure
The machine drives forwards
but not backwards.
Big leakage in one of the front
motors
Replace the actual motor.
The machine drives
backwards but not forwards.
Big leakage in one of the rear
motors
Replace the actual motor.
Reduced or no speed.
The belts between motor and
pump are slipping. Check if
the pump pulley rotates.
Replace the belts.
Big leakage in the pump.
Replace the pump.
The charge pump defective.
Replace the pump.
The pressure limit valve (2,5
bar) for the charge pump
defective.
Check the valve and its spring.
Speed control cable loose or
mowed.
Repair/adjust the speed control
cable.
Uneven speed.
Air in the system.
Oil leakage
Fill up with oil.
Check and repair the oil leakage.
Oil overheated.
Oil cooler contaminated.
Oil tank filter contaminated.
Clean the actual item.
