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2014-09-20 Workshop Manual, GGP Park 4 Hydraulic system 1
4 Hydraulic system
Contents in this chapter
General
The four wheel drive Park machines are equipped with hydraulic power transmission. I.e.
the engine drives an hydraulic pump, which pumps oil through the rear and front axle
drives. There are two main configurations; separate hydraulic pump and the hydraulic
pump integrated in the rear axle drive.
The front axle and rear axle are connected in series, which means that the front wheels
and rear wheels are forced to rotate at the same speed. To make turning easier, both axles
are equipped with a differential.
Some of the machines, both 2WD and 4WD, are also equipped with hydraulic assisted
steering and implement lifter.
Front-mounted implements are powered via drive belts.
This chapter contains a description of the hydraulic system, trouble shooting to isolate
faults and information about adjustments and corrective measures.
Since the steering torque converter and lifting cylinder belong to the respective chapter
(2 and 3), these components are described in detail in these chapters.
4.6 Hydraulic assisted steering ..... 18
4.6.1 Physical description............... 18
4.6.2 Functional description............ 18
4.7 Trouble shooting....................... 19
4.7.1 Drive system.......................... 19
4.8 External hydraulic..................... 21
4.9 Change of trans oil, 4WD ......... 24
4.9.1 Transmission with ext. pump 24
4.9.2 Trans w hydraulic pump in
rear axle drive........................ 27
4.1 Safety..........................................2
4.2 Configuration.............................2
4.3 Hydraulic pump int. rear drive..5
4.3.1 Physical description................5
4.3.2 Functional description ............6
4.4 Sep hyd pump f power trans ....8
4.4.1 Physical description................8
4.4.2 Functional description ............9
4.5 Hydraulic st. and impl lifter ......12
4.5.1 Physical description................12
4.5.2 Functional description ............13
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