Instruksjonsbok Volvo A25D - A30D

Hydraulic System

10

14

11

12 13

9

8

4

1

6 7

2

3

5

16 15 17

Efficient hydraulic system Designed using strong and reliable components, the hydraulic system offers high efficiency, very high reliability and a long service life. A closed center system with vari- able displacement piston pumps only consumes power when it is needed to minimize power losses and fuel con- sumption. Hydraulic pumps The A25D and A30D have five engine dependent vari- able displacement piston pumps. Three pumps work together to provide steering and dumping functions, while the others power the cooling fans. There is also a ground dependent pump for secondary steering. Pressure and flow vary automatically as needed. Circulation losses and heat generation are negligible. Service and cleaning A return oil filter with magnetic core provides effective oil filtration. Remote pressure checks are simplified with quick-couplings throughout the hydraulic system.

1 -Hydraulic pump, steering/dumping 2 -Hydraulic pump, steering/dumping 3 -Hydraulic pump, steering/dumping 4 -Hydraulic pump, intercooler fan motor

5 -Hydraulic pump, engine radiator fan motor 6 -Hydraulic pump, ground dependent, steering 7 -Steering cylinder 8 -Filter, coolant fan motor/Ground dependent pump 9 -Intercooler fan motor 10 -Dump lever 11 -Steering/dumping valve 12 -Steering system damping valve 13 -Hydraulic pressure quick-coupling block 14 -Hoist cylinder 15 -Engine radiator fan motor 16 -Hydraulic oil tank 17 -Hydraulic oil return filter

53