Dodge RAM TRUCK 1500 1995 Service Manual page 1464

BR
42RH TRANSMISSION OVERHAUL 21 -181
SERVO
PISTON
SNAP GUIDE
RING
S E A L
J912M72
F/gj. 56 Front Servo Components
REAR SERVO AND IAN0 OVERHAUL
BEAR
SERVO PISTON DISASSEMBLY
(1) Remove seal from servo piston. Note which way
seal lip faces for assembly reference.
(2) Compress cushion spring in vise only enough to
allow piston plug snap ring removal (Fig. 87). Use
wood block between vise jaws and end of piston plug
to keep plug aligned and in position.
(3) Remove snap ring from end of piston plug (Fig.
87).
(4) Open vise and remove wood block, piston plug,
cushion spring and servo piston.
Fig. 87 Servo Piston Plug Snap Ring Removal/
Installation
mmm SERVO INSPECTION
Clean the servo components (Fig. 88) with solvent
and dry them with compressed air.
Check rear band condition. Replace the band if dis­
torted, the lining is burned or flaking off, or the lin­
ing is excessively worn. Check the band pivot and
reaction pins. Minor pin scoring can be cleaned up
with crocus cloth. However, replace the pins if worn,
severely scored, or cracked. Replace the pin O-rings.
Inspect the servo components. Replace the servo
and cushion springs if collapsed, distorted or broken.
Replace the plug or piston if cracked, bent, or worn.
Discard the servo snap ring and spring retainer if
distorted or warped.
If doubt exists about the condition of any servo
component, replace it. Do not reuse suspect parts.
Fig. 88 Rear Servo Components
ASSEMBLING REAR SERVO PISTON
(1) Assemble piston plug, cushion spring and pis­
ton (Fig. 88).
(2) Compress cushion spring in vise and install pis­
ton plug snap ring (Fig. 87).
(3) Install new seal on piston. Be sure seal lip is
toward servo bore (Fig. 89).
(4) Lubricate piston seal with petroleum jelly. Lu­
bricate other servo parts with transmission fluid.