OM−01155
0 SERIES
MAINTENANCE & REPAIR
PAGE E − 11
GEARBOX DISASSEMBLY
(Figure 2)
When the pump is properly operated and main-
tained, the gearbox should not require disassem-
bly. Disassemble the gearbox
only
when there is
evidence of wear or damage.
Gearbox disassembly in the field is not rec-
ommended. These operations should be
performed only in a properly equipped
shop by qualified personnel.
If the gearbox requires disassembly, first disas-
semble the pump components as indicated in
PUMP AND SEAL DISASSEMBLY
. Protect the ex-
posed pinion shaft (1) and bearing (2) with a card-
board tube or barrier paper taped to hold it in
place.
Before attempting to disassemble the gearbox, re-
move the drain plug (24) and drain the lubricant.
Clean and reinstall the drain plug.
After draining the gearbox lubricant, remove the
hardware (21 and 22) securing the oil sump (20)
and gasket (19) to the gearbox housing (5).
Remove the drive shaft key (16) and slinger ring
(15) from the shaft. Disengage the hardware (13
and 14) and remove the bearing cover (13), oil seal
(18) and gasket (6) from the gearbox housing. In-
spect the oil seal and, if replacement is required,
press it from the bearing cover.
Disengage the capscrews (27) and remove the
cover plate (26) and gasket (30). Position the gear-
box on the bed of an arbor (or hydraulic) press with
the pump side up. Press the drive shaft (17) and
bearing (14) from the gearbox housing. Pull the
spacers (3 and 3A) and drive gear (25) from the
housing as the shaft is forced out. Remove the key
(29) from the drive shaft.
The inboard bearing (28) will remain in the gearbox
housing. Inspect the bearing in place as described
in the following paragraphs and, if replacement is
required, pull the bearing out of the housing.
Reposition the gearbox housing on the press with
the pump side down, and press the pinion shaft (1)
and bearings (2 and 12) from the housing.
After removing the shafts and bearings, clean and
inspect the bearings
in place
as follows.
To prevent damage during removal from
the shaft, it is recommended that bearings
be cleaned and inspected
in place
. It is
strongly
recommended that the bearings
be replaced
any
time the shaft and bear-
ings are removed.
Clean the gearbox housing, shafts and all compo-
nent parts (except the bearings) with a soft cloth
soaked in cleaning solvent. Inspect the parts for
wear or damage and replace as necessary.
Most cleaning solvents are toxic and
flammable. Use them only in a well-ven-
tilated area free from excessive heat,
sparks, and flame. Read and follow all
precautions printed on solvent contain-
ers.
Clean the bearings thoroughly in
fresh
cleaning
solvent. Dry the bearings with filtered compressed
air and coat with light oil.
Bearings must be kept free of all dirt and
foreign material. failure to do so will greatly
shorten bearing life.
Do not
spin dry bear-
ings. This may scratch the balls or races
and cause premature bearing failure.
Rotate the bearings by hand to check for rough-
ness or binding and inspect the bearing balls. If ro-
tation is rough or the bearing balls are discolored,
replace the bearings.
The bearing tolerances provide a tight press fit
onto the shaft and a snug slip fit into the gearbox
