SHOP MANUAL
Ch 5 page 7
HYDRAULIC SYSTEM
The hydraulic system has three pumps.
The steering system, accumulators and tilting functions are fed by hydraulic pump 1 (145ccm/rev.).
Cooling fan system and the tilting functions are fed by hydraulic pump 2 (60ccm/rev). Both pumps are driven by
the engine.
The emergency sterring system is fed by the emergency steering pump (3) (maximum 50 l/min) which is driven
by the truck’s motion, either forwards or backwards.
The hydraulic system has three primary functions:
First primary function: supply the steering power and transmit the drivers steering motion from the steering
wheel to the steering cylinders (pump 1) and maintain safe the steering function also when the engine fails
(pump 3).
Second primary function: supply the brake accumulator with pressure in the accumulator chamber (pump 1)
and feed the cooling fan motor which provides sufficient fan speed to maintain the engine operating tempera-
ture within given limits (pump 2).
Third primary function: supply power to the tilting cylinders to manage unloading the dumper body (pumps 1
and 2).
Hydraulic system main function.
1
2
3
Accumulator 3,0 litre
left hand side.
Accumulator 3,0 litre
right hand side.
Rear service brake
Accumulator 3,0 litre
right hand side
.
vice brake
Accumulator 1,0 litre
left hand side.
Park brake
Figure 2
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