National Crane 1-21-2019 Control # 104-07 6-5
1400A SERVICE MANUAL SWING
3. Slide planet gears (25) and races (28) out of the input
carrier (13).
4. Remove the plate (30) from the input carrier (13).
5. If needle bearings (29) must be replaced, they may now
be removed out of the input planet gears (25).
6. Rebuild input gear set in reverse order using any
required new parts.
7. Before reassembly, be sure to insert the plate (30) into
the input carrier (13).
8. To reassemble, be careful to line up the planet pins (27)
with the races (28) and the bearings (29) and then press
the knurled part of the planet pin (27) into the input
carrier (13). If the planet pins (27) are not lined up
properly, the races (28) can be shattered during the
pressing process. Reinstall the retaining washers (26)
onto the planet pins.
Output Planetary Repair
(See Figure 6-2 for reference (#) numbers.)
Repair for the output planetary gear set is the same as the
input planetary gear set with one exception. The output
planetary gear set has two needle bearings (22) per
planetary pin (20) with a spacer (23) between the bearings.
Shaft Repair
(See Figure 6-2 (#) for reference numbers.)
1. Tapered bearing (4) may be removed from output shaft
(2) using a gear puller.
2. Remove old seal (3) and discard. Grease pack the lower
bearing (4) with lithium grease or EP lube and install into
the bearing race (5) in the gear 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. Use a press fixture or a hammer and a large flat-
ended bar or rod to 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.
3. Install the output shaft (2) into gear housing (1) Be
careful not to damage seal (3) in gear housing.
Case Assembly Repair
(See Figure 6-2 for reference numbers.)
1. Remove the bearing race (6) and replace if required.
2. Clean all foreign material from case.
Unit Assembly
(See Figure 6-2 for reference numbers.)
1. Place the gear housing (1) on a table with the gear end
of the output 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. Grease pack the upper bearing (7) with lithium grease or
EP lube. Slide the bearing (7) over the threaded end of
output shaft (2) with the small end down. Press the
bearing (7) on slowly until it is just seated.
Hold the output shaft (2) and rotate the gear 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
output 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 - 9.6 N·m
(75 - 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 - 9.6 N·m (75 - 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 gear housing (1) on a table with the gear end
of the output shaft (2) on the table surface.
8. Lower the output gear set (10) into the gear housing (1)
until the planet gears engage the teeth in the gear
housing. Lower the output gear set (10) until the planet
gears engage the teeth on the output shaft (2). Rotate
the output gear set (10) or the output shaft (2) until the
gear set (10) slides down to allow full contact between
the two sets of gear teeth.
9. Firmly hold the pinion end of the output shaft (2) and
slowly rotate the gearbox assembly to ensure free
rotation of installed gear sets.
CAUTION
The output shaft and case are not retained together at this
point. Move the unit so that the output shaft and gear do
not separate.
Fo
r
Reference
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