SECTION 3 / OIL LEAKS
13
Problems That Cause Oil Leaks
A. Drain Plug
A loose drain plug (6) or damaged drain plug ring (5).
B. Oil Reservoir
A damaged oil reservoir (3), missing oil reservoir filter (2), or damaged O-ring (4).
If the oil bath housing (7) is overfilled, oil will leak from vent cap (1).
C. Weep holes
If oil is leaking from the weep holes (15), there is either a leak in the low-pressure
seals (39) or the high-pressure seals (20); or there is piston (13) damage.
D. Pump Shaft Seal
A damaged or worn pump shaft seal (8).
12...Swash
10...Swash assembly
9...Forward O ring
8...Pump shaft seal
7...Oil bath housing
4...O-ring
3...Oil reservoir
2...Oil filter
1...Oil reservoir vent cap
31...Detergent check valve
32...O-ring
33...Ball bearing
34...Spring
17...Pressure/volume control knob
18...Bypass valve
19...Bushing
30...Water inlet filter
25...Low pressure check valve basket (3)
56...Water outlet bolt (4)
13...Piston (3)
46...High pressure valve seat (3)
38...Thermal relief valve
20...High pressure seal (3)
6...Oil drain
plug
39...Low pressure oil seal (3)
40...Seal retaining ring (3)
41...Bushing seal (3)
42...Bushing (3)
45...High pressure valve slide
55...Safety relief valve
54...Ball bearing
53...Ball bearing seat
52...Spring
51...Pump head bolt (4)
50...High pressure valve cap (3)
37...Retainer nut
47...High pressure valve plate (3)
48...High pressure valve spring (3)
49...High pressure valve basket (3)
26...Low pressure check valve spring (3)
27...Low pressure check valve plate (3)
28...Low pressure check valve seat (3)
44...Piston guide retaining screw (2)
22...Water outlet
43...Scraper ring (3)
35...Detergent tube
36...Detergent filter
5...Oil drain
plug ring
11...Swash plate ball bearings
29...Water inlet
23...Non-return check valve
24...Nozzle insert
21...Pump head
14...Piston spring (3)
16...Piston housing
15...Weep holes (3)
Pump 785 9/28/01 3:06 PM Page 13
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