Kalmar ContChamp DRD S Series, Technical Handbook

Page: 239 / 298

ContChamp DRD-S
Technical Handbook
Hydraulic pumps
Description
35 S. Grupp 70
9407
04-10
Variable axial piston pump
The two double variable pumps H2 and H3 that feed the lift, boom
extension and top lift are variable axial piston pumps with five pis-
tons placed in a cylinder rotor. The stroke length of the pistons is
determined by the position of an angled pressure plate. The pis-
tons are secured in slip-shoes that rotate against the pressure
plate. The stroke volume area and the area within the pistons are
filled with hydraulic fluid during the suction phase. During the
pressure phase, the hydraulic fluid is fed into the pressure lines
via a valve plate. A hole in the head of each of the pistons allows
hydraulic fluid to be forced out and gives a balanced counter
pressure from the pressure plate as well as a film of fluid that lu-
bricates the surfaces and inhibits wear.
1. Rear housing
2. Control piston
3. Slip-shoe
4. Valve plate
5. Pump housing
6. Sealed axle bearing
7. Axle packing
8. Cylinder rotor
11. Pressure plate
12. Pump piston
13. Pressure spring
14. Drive axle
15. Suction line connection
16. Pressure line connection
17. Regulator DFR
18. Max pressure setting
19. Stand-by pressure setting
Variable axial piston pump
KL1420a
18 19
1 2 3 4 5 6 6 7 8
11
12
13 14
15
16
17
17
19
18
19
2 2
18