10
Problems That Cause Water Leaks
A. Thermal Relief Valve
The thermal relief valve (18) protects the pump from hot water temperatures in bypass
mode. If the thermal relief valve is damaged or does not reset, there will be a continual
leak. Check thermal relief valve.
B. Weep Holes – High-Pressure Seals
Water leaking from the slot holes (13) can indicate a leak in the high-pressure seals (29).
Check seals for damage.
SECTION 2 / WATER LEAKS
8...Swash plate ball bearings
6...Swash plate housing
4...Forward O-ring
2...Oil bath housing
37...Ball bearing
38...Spring
10...Piston (3)
41...High-pressure valve plug (3)
29
...
Bushing (3)
30...High pressure seal (3)
47...Pump head bolt (4)
44...High-pressure valve cap (3)
43...High-pressure valve spring (3)
42...High-pressure valve cage (3)
11...Piston spring
12...Piston housing
33...Water outlet
21...Water inlet
31...non-return check valve
31...Nozzle insert
22...Water
inlet filter
40...Detergent filter with
metering valve
9...Swash disk
1...Pump shaft
35...Nipple
20...Bypass valve
19...Spring
18...Thermal relief valve
17...Thermal relief
valve housing
16...Screw (2)
15...Deflector cap
14...Fastening cap
27...Low-pressure valve basket (3)
26...Low-pressure valve spring (3)
25...Low-pressure valve plate (3)
24...Low-pressure valve seat (3)
5...Pump shaft ball bearing
7...Nut
39...Detergent tube
34...Retainer clip
36...Detergent non-return
check valve
23...Connection piece (2)
13...Weep holes (3)
45...High-pressure valve seat (3)
46...Pump head
3...Pump shaft seal
28...Oil seal (3)
Pump 777 9/28/01 3:56 PM Page 10
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