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7
1
suction valve
2
pressure valve
3
pressure gauge
4
oil reservoir
5
motor shaft
6
shaft seal
7
motor bearing
8
swash plate
9
piston glide shoe
10
piston spring
11
piston
12
oil seal
13
washer
14
low-pressure seal and support ring
15
bushing
16
washer
17
high-pressure seal
18
support ring
19
piston housing
20
O-ring
21
cylinder head
Unit function
Pump
Function
The pump is a 3-piston swash plate pump with
drive running in an oil bath. It is directly attached
to the motor shaft, therewith achieving optimal
efficiency. When the piston returns, the water is
taken in via the open suction valve. The advan-
cing piston closes the suction valve and the
water is transported to the nozzle via the open
pressure valve.The operating pressure genera-
ted depends on the diameter of the nozzle bore.
Summary of Contents for HD 1090
Page 1: ...HD 1090 Service Handbook 0 I 5 905 212 03 02...
Page 4: ...2 Unit function Equipment 10 15 12 9 10 13 11 14 16 1 8 2 3 4 5 6 7 0 I...
Page 6: ...4 Unit function Functional diagram 5 3 7 8 9 10 11 12 13 14 2 1 15 16 17 4 6...
Page 8: ...6 Unit function Pump 15 17 18 10 12 13 11 14 16 20 9 12 11 1 8 2 3 4 5 6 7 11 19 21...
Page 10: ...8 Unit function Pressure and flow control with the Servopress handgun 1 2 4 3...
Page 14: ...12 Unit function Handgun with pressure and flow control Servopress with low effort version...