DISASSEMBLY OF OIL PUMP
1. Remove three cap screws (72) and separate the oil pump
housing cover (62) from the oil pump body (73).
2. Remove the snap ring (63).
3. Remove the eccentric ring (66) and outer geroter (65). Remove
friction plug (68) and spring (67).
4. Remove inner geroter (64).
5. Remove Woodruff key (71) from the pump shaft (70).
6. Remove bottom snap ring (63).
7. Remove pump shaft (70) from oil pump body (73).
DISASSEMBLY OF CRANKSHAFT ASSEMBLY
1. Remove oil pump drive flange (56) by removing lock wire (59)
and three cap screws (58) and lock washers (57).
2. Remove lower rest bearing (53) from crankshaft (17).
3. Remove lower bearing spacer (52) from crankshaft.
4. Remove minor balance weight casting (49) and lower bearing
(51) from crankshaft.
5. Remove bearing (51) from minor balance weight casting.
6. Remove bearing (47) from crankshaft. It this bearing comes
out with the minor balance weight casting, remove it from
the casting.
7. Remove major balance weight assembly (38) from the
crankshaft and remove flat head Allen Head screw (22) and
crankshaft key (21).
8. Remove major balance top sleeve (25) from major balance
weight casting.
9. Remove oil baffle (26) from drive head cover (33) by removing
lock wire (28) and eight cap screws (29) and lock washers (27).
10. Remove drive head cover (33) from the crankshaft (17).
11. Remove upper crankshaft bearing (23) from the crankshaft.
12. The beveled ring gears (43 and 48) are bolted to the two
balance weights, and will be removed with the balance
weights. When the drive head has been completely
disassembled, all parts should be checked, and worn or
damaged parts should be replaced.
DRIVE HEAD ASSEMBLY
After inspecting and replacing worn and damaged parts, the
drive head should be reassembled as follows:
CRANKSHAFT ASSEMBLY
1. Check the fit of the crankshaft key (21) in the keyways of the
crankshaft (17) and the major balance flange (39). The key
must be a tight fit in both of these keyways. Any looseness will
require replacement of the worn part.
2. Clean out the oil hole through the center of the crankshaft (17)
by means of a wire rod with a cloth wrapped around the end.
3. Place the drive head cover (33) on the crankshaft.
4. Apply a light coat of motor oil to the inside surface of the drive
head cover and on the crankshaft.
5. Place the upper crankshaft bearing (23) on the crankshaft
and force into the drive head cover and onto the crankshaft
bearing journal.
6. Bolt the oil baffle (26) to the drive head cover using eight cap
screws (29) and lock washers (27). Run lock wire (28) through
the drilled heads of the cap screws. NOTE: Lip of oil baffle
must face away from the drive cover.
7. Insert the crankshaft key (21) in the crankshaft keyway and
lock in place with Allen Head screw (22).
8. Drive the major balance top sleeve (25) into the top of the
major balance weight (38).
9. Fit the major balance weight flange (39) into the major
balance weight (38). This is a force fit, and the flange may have
to be hammered with a soft hammer to force it in place.
10. Bolt the major balance flange (39) to the major weight with
6 cap screws (41) and lock washers (40). Run lock wire (42)
through the drilled heads of the cap screws.
11. Apply a light oil lubricant to the crankshaft.
12. By means of a hoist, lower the major balance weight casting
down on the crankshaft. Care should be taken to guide the
housing onto the crankshaft key.
13. Make certain that the seating surfaces of both the bevel ring
gear (43) and the major balance flange (39) are free of dirt,
debris and burrs. Bolt the bevel ring gear to the major balance
flange with 12 cap screws (45) and lock washers (44). Run lock
wire through the drilled heads of the cap screws. NOTE: Gears,
including the pinion, must be replaced in matched sets only.
14. Press the minor balance bearing (47) onto the crankshaft (17)
and force it down on the shaft until it is up against the major
balance flange (39).
15. Place the minor balance bearing spacer (50) on the crankshaft,
resting on the minor balance bearing (47).
16. Make certain that the seating surface of both the bevel ring
gear (48) and the minor balance weight casting (49) are free
of dirt, debris and burrs. Bolt the bevel ring gear to the minor
balance weight with 12 cap screws (45) and lock washers (44).
Run lock wire through the drilled heads of the cap screws.
17. By means of a hoist, lower the minor balance weight casting
(49) on the crankshaft and fit the casting on the minor
balance bearing (47).
18. Place the roller bearing (51) in the minor balance weight
casting (49) and press in place.
19. Place the lower bearing spacer (52) on the crankshaft against
the roller bearing (51).
20. Press the spherical roller bearing (53) onto the crankshaft. This
bearing should be pressed onto the shaft until it is up against
the lower bearing spacer.
21. Bolt the oil pump drive flange (56) to the bottom of the
crankshaft with three cap screws (58) and lock washers (57).
Run lock wire through the drilled heads of the cap screws.
OIL PUMP ASSEMBLY
1. Insert the pump shaft (70) through the pump body (73).
2. Place the lower lock ring (63) on the shaft.
3. Place the Woodruff key (71) in the shaft.
4. Place the inner geroter (64) on the shaft.
5. Place the top lock ring (63) in place on the shaft.
6. Place spring (67) and friction plug (68) in the outer
geroter (65).
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