8
field repair
General
Geareducers can be repaired in the field—however, major repairs
require the use of a fully equipped machine shop. When field repair
or replacement of parts is necessary, the following procedure is
recommended for the disassembly and assembly of the unit. If any
O-ring, oil seal or gasket is to be reused, care should be taken
not to damage it during disassembly. Parts which contain O-rings
or seals should not be jerked or twisted past a shoulder or edge.
These parts are marked with an asterisk (*) in the description
below. O-rings, oil seal and gaskets should be carefully inspected
for damage before being reinstalled. New O-rings and oil seal
should be installed during a major overhaul.
Disassembly
Part numbers and references—refer to
Figure 2
1. Drain oil.
2. Remove outer ring of bolts in pinion cage cap and remove
pinion subassembly*.
Note
—The thickness of the shim pack (
320
) is important in resetting
the gears. The shim pack should either be saved or carefully
measured with a micrometer. If the gears are to be replaced,
record the pinion setting distance that is etched on the pinion gear.
3. Remove water slinger*.
4. Remove bearing retainer and shim pack (
420
) from top of
case.
Note
—The thickness of this shim pack is important in the backlash
setting of the gears. The shim pack should either be saved or
carefully measured with a micrometer.
5. Drive dowel pins down into case.
6. Remove bolts and case cover and lift fan shaft assembly out
of the case.
7. Turn case over and remove bottom cap and shims.
Note
—The thickness of this shim pack is important in setting the
fan shaft bearing endplay. This pack should be saved or carefully
measured with a micrometer.
8. Remove bearing cups (
411
and
412
) from the Geareducer
case and cover.
Pinion Cage Disassembly
1. Remove pinion cage cap* from pinion cage.
2. Remove O-rings* (
503
and
50
4).
3. Slide seal off of pinion shaft and remove O-ring (
505
).
3. Remove locknuts and lockwasher (
103
and
104
) then press
pinion shaft (
101
) out of pinion cage. This will free tail bearing
cone (
312
).
4. Press oil slinger (
301
) and head bearing cone (
311
) from the
pinion shaft.
5. Press bearing cups (
311
and
31
2) out of pinion cage.
Fan Shaft Disassembly
1. Remove ring gear (
101
) from the ring gear hub
(
5
).
2. Press ring gear hub and lower bearing cone (
411
) off of the
fan shaft (
201
).
3. Remove lower fan shaft key (
202
).
4. Press the top bearing cone (
412
) off of the shaft.
Summary of Contents for MARLEY Geareducer 1800
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