28
PRIMARY PLANET CARRIER
CH280 ONLY
Disassembly
1. Remove the planet gears using a punch and driving
the roll pins (Item 6) into the center of the planet gear
shafts (Item 3). Slide the planet shafts out of the planet
carrier.
2. Use a punch to drive the roll pins out or the planet gear
shafts.
DO NOT
reuse the roll pins.
3. Remove the planet shafts, bearings, spacers, thrust
washers and gears. The bearing rollers are loose in
the planet gear, so take precautions to ensure they are
contained when the planet gear is removed from the
planet carrier. Holding the thrust washers against the
gear as it is removed from the planet carrier will help
keep them in place.
4. Thoroughly clean all parts and inspect for damage and
wear. The bearing rollers should not exhibit any irregu-
larities. If the rollers show any sign of spalling, cor-
rosion, discoloration, material displacement or abnor-
mal wear, they should be replaced. The thrust washer
contact areas should be free from any surface irregu-
larities that may cause abrasions or friction. The gears
and shafts should be inspected for abnormal wear or
pitting. Replace if necessary.
Assembly
1. Place the planet carrier on a clean work surface with
the roll pin side down.
2. Place a planet gear (Item 2) on a clean work surface
resting on the gear teeth. Apply grease to the loose
rollers (Item 4) and set in the lower half of the planet
gear. Apply grease to one of the thrust washers (Item
5) and push onto the planet gear letting the grease
hold in place. Slide the planet shaft (Item 3) into the
planet gear and through the thrust washer. Grease
and install the remaining rollers around the planet
shaft. There are 19 rollers in each planet gear. Grease
and install the remaining thrust washer (Item 3) onto
the planet gear shaft and against the planet gear. Ro-
tate the planet gear so it is positioned for installation
into the planet carrier resting on the table. Remove the
planet shaft while holding the thrust washers against
the gear to keep the loose rollers in place.
3. Carefully slide the planet gear, bearings, and thrust
washers into the planet carrier. The thrust washers
must be held against the gear to keep the loose roll-
ers positioned in the planet gear. Slide the planet gear
shaft into the carrier and through the planet gear bear-
ings.
4. Carefully align the pin hole in the planet carrier with
the hole in the planet shaft and drive a new roll pin into
place –
ALWAYS USE NEW ROLL PINS
. Ensure that
the new roll pin is slightly recessed into the planet car-
rier. With a center punch, stake the planet carrier next
to the pin hole. This will distort the hole and prevent
the pin from backing out during operation.
5. Repeat the above steps for each of the three planet
gears.
5
3
6
2
1
4
5
