Stiga PARK 120 2016 Workshop Manual page 29

Edition Workshop Manual
2016 PARK 120 - PARK 220
4.1 Safety
A high level of cleanliness is mandatory when carrying out all operations on the
hydraulic system. Foreign objects and contaminants would jeopardize system
operation and reliability. Always protect and plug the ends of pipes, lines and
connectors when replacing components.
4.2 Description
The hydrostatic transmission (HST) consists of a hydraulic pump and a hydraulic motor.
The hydraulic pump is mechanic connected to the drive belt.
The power from the pump is transmitted to the motor by an oil flow.
Since both the oil flow and the flow direction is controlled by the drive pedal, the machine
can move both forwards and backwards with a stepless gear ratio.
4.3 Repair
Since trouble with the HST is very rare.
There for it is no need for any repair instructions in this book.
Oil leakage can occur for various reasons.
Therefore it is described on next page how oil can be filled.
Should major repair to the HST be needed, please refer to the service provided of the
transmission manufacturer.
4.4 HST oil
4.4.1 General
It is recommended that oil filling should only be performed if one or both of the following
conditions are met:
• There is a visible oil leakage.
• Traction problems.
Oil
Volume
Caution!!!
U.M.
ml
Chapter
4 Hydraulic system
PARK 120
20W-50
2055
Page
29
PARK 220
2155