Manitowoc National Crane NBT30H-2, Руководство по обслуживанию

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6
National Crane
03-20-2019 Control # 613-06
6-5
NBT30H-2 SERVICE MANUAL SWING
Pinion Shaft Repair
(See Figure 6-2 for reference numbers.)
1. Remove the outboard race (5) and bearing (4) from the
pinion shaft (2).
2. Remove the outboard seal (3) and discard.
3. Remove the V-seal (31) and discard.
4. Pack the outboard bearing (4) with lithium grease or EP
lube and install into the outboard bearing race (5) in the
gearbox housing (1). The old bearing (4) may be reused
only if it was removed to replace the seal and was not
the cause of the seal failure.
5. Install the new v-seal (31) into the gear housing.
6. Press the new seal (3) into the gear housing (1) until the
seal is flush.
NOTE: If the bearing (4) is replaced, the bearing race (5)
must also be replaced.
7. Install the pinion shaft (2) into gear housing (1). Be
careful not to damage the seal (3 and 31) in the gear
housing.
Case Assembly Repair
(See Figure 6-2 for reference numbers.)
1. Remove the inner bearing race (6) and replace if
required.
2. Clean all foreign material from case.
Gearbox Assembly
(See Figure 6-2 for reference numbers.)
1. Place the gear housing (1) on a table with the gear end
of the pinion shaft (2) on the table surface.
2. Hold the gear of output shaft (2) and rotate the gear
housing (1) to be sure it moves freely. The slight
resistance is due to seal load on the output shaft (2).
3. Pack the upper bearing (7) with lithium grease or EP
lube. Slide the bearing (7) over the threaded end of the
pinion shaft (2) with the small end down. Press the
bearing (7) on slowly until it is just seated.
Hold the pinion shaft (2) and rotate the gearbox housing
(1) when installing the bearing (7). The bearing is seated
when all rollers are rotating evenly.
NOTE: If bearing (7) is replaced, bearing race (6) must
also be replaced.
4. Slide the lockwasher (8) down the threaded end of the
output shaft (2) until it reaches the end of the bearing (7).
5. Thread the locknut (9) down the threads of the output
shaft (2) and tighten until it is snug.
6. Set the bearing preload by tightening locknut (9) onto
pinion shaft (2) to 135 N·m (100 ft-lb). Proper bearing
preload is determined by the rolling torque method. This
method involves increasing press load on the bearings
(4 and 7) until drag or rolling resistance of 8.4 to 9.6 Nm
(75 to 85 in-lb) is achieved when rotating the case.
This includes bearing as well as seal drag. The torque is
equal to a force of 8.4 to 9.6 Nm (75 to 85 in-lb) on a bolt
screwed into one of the brake assembly mounting holes
to rotate the case. Bend tang of lockwasher (8) into
place on locknut (9).
7. Place the gearbox housing (1) on a work bench with the
gear end of the pinion shaft (2) on the table surface.
8. Lower the output planet gear set (10) into the gearbox
housing (1) until the planet gears engage the teeth in the
gearbox housing. Line up the gear teeth and slide the
output planet gear (10) down until the planet gears
engage the teeth on the pinion shaft (2). Rotate the
output gear set (10) or the pinion shaft (2) until the gear
set (10) slides down to allow full contact between the two
sets of gear teeth.
9. Firmly hold the gear end of the pinion shaft (2) and
slowly rotate the gearbox assembly to ensure free
rotation of installed gear sets.
10. Install the thrust washer (11) and the output sun gear
(12) in the end of the output planet gear set (10).
11. Lower the input planet gear set (13) into the gear
housing (1) until the gears engage the teeth on the
output sun gear (12).
12. Rotate the input planet gear set (13) or the pinion
shaft (2) until the input planet gear set (13) slides down
to allow full contact between the two sets of gear teeth.
13. Firmly hold the gear end of the pinion shaft (2) and
slowly rotate the gearbox assembly to ensure free
rotation of installed gear sets.
14. Install thrust washer (11b) and the input sun gear (12)
into the input planet gear set (13).
15. Lubricate a new O-ring (14) and install in the groove in
the top of the gear housing (1).
16. Place the brake assembly (15) onto the top of the gear
housing (1) as per removal scribe marks.
17. Install the eight capscrews (16) in the brake assembly
(15) and torque to recommended values, refer to
Fasteners and Torque Values , page 1-12.
18. Install the drain plug (17).
19. Reinstall the swing motor and fill the swing gearbox with
EP 80-90 oil until the oil is level with the fill hole.
20. Reinstall the level plug and breather/fill plug.