Pump Rebuild; Disassembly; Cleaning And Inspection - Komatsu 730E Operation & Maintenance Manual

OM4035.2 02/03
Automatic Lube System

PUMP REBUILD

Be certain to bleed steering accumulators to relieve
hydraulic pressure and to relieve pump outlet
grease pressure before removing any hoses or fit-
tings.

Disassembly

1. Remove the four socket head screws (33, Figure 3-
10) and separate the manifold (37) from the hydrau-
lic motor (42).
2. Remove pipe plug (45) and drain the crankcase oil
from pump housing (46).
3. Remove the six screws (29) and remove the hous-
ing cover (30) and cover gasket (31).
4. Remove retaining ring (57) and pull the shovel plug
(56) from the housing tube (55).
5. Remove two socket head screws (44) and separate
hydraulic motor (42) from the pump housing (46).
6. Remove two outlet pin nuts (50) from pump housing.
7. Remove the pump subassembly (1 through 28) from
the pump housing. Pushing the subassembly up
with a .75 in. (19 mm) diameter wooden or plastic
rod against the check seat housing (28) is helpful.
8. Remove the housing tube (55) from the pump
housing by inserting a .75 in. (19 mm) diameter rod
through the inlet holes at the bottom of the housing
tube and unscrewing it.
9. Remove the bronze bearing (51), O-ring (52), back-
up washer (53), and O-ring (54) from the housing
tube.
10. Remove the crankrod assembly (1 through 8) from
the pump by unscrewing the button head screws
(12) and then pulling out the wrist pin bushings (13).
11. Remove the check seat housing (28) from the recip-
rocating tube (21).
Note: There is a 3/8 in. allen head socket in the throat of
the check seat housing to facilitate removal.
12. Unscrew the wrist pin anchor (14) from the recipro-
cating tube (21) and pull the plunger assembly (9
through 20) from the tube.
13. Using a .50 in. (13 mm) diameter wooden or plastic
rod, push the cup seal (22) and the pump cylinder
(24) from the reciprocating tube.
14. Remove the pump plunger (20) from the plunger link
rod (17). (A spanner wrench, which uses the holes
in the the pump plunger, is required.)
15. Unscrew the plunger link rod (17) from the plunger
tube (11) and slide off the cup seal (16) backup
washer (15) and wrist pin anchor (14).
16. Unscrew the plunger tube (11) from the outlet pin (9).
17. To dismantle the crankrod assembly (1 through 8),
remove flat head screws (1) and the inner and outer
weights (2 & 3).
18. Remove the small retaining rings (6) and press the
crank eccentric (7) out of the ball bearing (8). Be
sure to support the ball bearing on the inner race.

Cleaning and Inspection

1. Discard all seals and gaskets. Repair kits are avail-
able containing all the necessary seals and gaskets
for reassembly. Refer to the appropriate truck parts
book.
2. Clean and inspect the following parts. Replace if
excessive wear is evident:
•Ball bearing (8)
•Crank eccentric (7)
•Crankrod (5)
•Wrist pin bushings (13)
•Plunger tube (11)
•Pump plunger & upper check parts (20, 19 & 18)
•Pump cylinder (24)
•Check seat housing/lower check ball (28, 26)
•Upper bronze bushing (51)
•Housing tube (55)
•Shovel plug (56)
•Reciprocating tube (21)
Maintenance - Section 4
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