32
DISASSEMBLY
DRUM CLUTCH ASSEMBLY SERVICE
1.
Remove the clutch springs (Item 151).
2.
Check the clutch spring (151) free length; minimum
free length should be 2.5 inches (63.5 mm). Check
the springs for signs of cracks or other failure. If any
spring must be replaced for any reason, then ALL
clutch springs must be replaced.
3.
Remove the piston (29). Discard the quad rings (34,
35).
4.
Remove spacer ring (39) and clutch plates (30,31).
5.
Remove clutch hub (36), pressure plate (32), and
retaining ring (33). Thoroughly clean all parts and in
-
spect for wear or damage. Check the piston sealing
surfaces for any scoring could damage seals or create
any sealing problems. Make certain the clutch pres-
sure port is open and free of contamination.
ASSEMBLY
1.
Place the ring gear housing (28) on a clean work sur
-
face with the large end facing down.
2.
Install new quad rings (34,35) into the clutch piston
(29) grooves. Lubricate the O-rings liberally and install
the piston into the ring gear housing. Apply even pres-
sure to the piston to seat the piston seals into the ring
gear and press the piston into place. Be sure to seat
the piston into the bottom of the ring gear bore.
3. Flip the clutch housing over and install spacer ring
(39). Insert clutch plates beginning with separator
plate (31) and then brake plate (30).
4.
Install clutch hub (36).
5.
Place the pressure plate (32) into the clutch housing.
6.
Install retaining ring (33) into the groove. Make certain
the retaining ring is fully seated into the bottom of the
groove.
The drum clutch assembly weighs approximately 620
lbs. (281 kg). Ensure lifting equipment has adequate
capacity.
CAUTION
!
!
The ring gear housing weighs approximately 260
lbs. (118 kg). Make certain lifting equipment has ad
-
equate capacity.
CAUTION
!
!
Failure to replace the clutch springs as a complete
set may result in uneven clutch application pressure,
and accelerated and repeated drum clutch and clutch
spring failure.
CAUTION
!
!
The clutch housing weighs approximately 260 lbs.
(118 kg). Make certain lifting equipment has ade
-
quate capacity.
CAUTION
!
!