Drum Assembly Service - BRADEN BG4A Installation Maintenance And Service Manual

DRUM ASSEMBLY SERVICE

1. Remove the bearing and seal from each end of the drum.
Check the ring gear teeth (machined into the inside surface
of the drum) for nicks, spalling or excessive wear. Replace
the drum if wear is greater than 0.015 in. (0.4 mm) when
compared to unworn area of teeth.
2. Install new bearings in the drum if replacement is neces-
sary. Apply a non-hardening sealant on the outside diameter
of each new seal and press the seals into the drum, using a
flat plate to avoid distortion.
PLANET CARRIER SERVICE
1. First drive the rollpins (17) into the center of the planet
shafts (14). Now you can remove the planet shaft (14), two
thrust races (16), planet gear (13) and roller bearing (15).
Repeat this procedure for the other two planet gears. Thor-
oughly clean all parts and inspect for damage and wear. The
bearing rollers should not exhibit any irregularities. If the
rollers show any sign of spalling, corrosion, discoloration,
material displacement or abnormal wear, the bearing should
be replaced.
Likewise, the cage should be inspected for unusual wear or
deformation, particularly the cage bars. If there is any dam-
age that will impair the cage's ability to separate, retain and
guide the rollers properly, the bearing should be replaced.
The thrust washer contact areas should be free from any
surface irregularities that may cause abrasions or friction.
The gears and shafts should be inspected for abnormal wear
or pitting. Replace if necessary.
2. Insert a bearing into a planet gear and place a thrust race
on each side of the gear. Position this assembly in the plan-
et carrier and slide the planet gear shaft through the carrier.
Align the pin hole in the shaft with the hole in the carrier and
drive a NEW rollpin into place. ALWAYS USE NEW ROLL-
PINS. When properly positioned, the rollpin will be slightly
below the surface of the carrier.
3. With a center punch, stake the carrier next to the pin hole
as shown. This will distort the hole so the pin will not back
out when in service. Repeat these steps for each of the
three planet gears.
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