Low-Reverse Servo Assembly
Low-Reverse Servo Assembly
Refer to Fig. 25.
Removal
1. Raise the vehicle on a hoist so the transmission oil pan is accessible.
2. Starting at the rear and working toward the front, loosen the oil pan attaching bolts and drain the fluid from the transmission. If the same fluid is to be used again, filter the fluid through a 100 mesh screen. Reuse the fluid only if the fluid is in good condition.
3. Remove the transmission oil pan attaching bolts, pan and gasket. Discard gasket.
4. Remove three dacron filter to valve body attaching bolts and remove the dacron filter, grommet and gasket. Discard gasket. If the fluid is contaminated, discard the dacron filter (do not clean the filter).
5. Remove the detent spring and attaching bolts.
6. Remove the valve body to case attaching bolts (25). Remove the valve body. Discard valve body to case gasket.
7. Depress the reverse servo piston cover with a hammer handle. Remove the retaining snap ring and piston cover.
NOTE: Reverse servo piston may spring free from case when cover is removed. Care must be taken to prevent such an occurrence.
8. To remove the reverse servo piston and spring, apply air pressure to the servo piston release passage using Tool 180L-77030-8 or equivalent. Cover the servo piston pocket to prevent the piston from falling Out the case when air is applied and becoming damaged.
Installation
1. Clean and inspect the servo pocket in the case.
2. Clean the reverse servo piston, cover and return spring. Inspect the piston and cover sealing edges for cuts, burrs or irregular wear pattern. Replace if necessary.
3. Assemble the return spring to the servo piston.
4. Install the reverse servo piston and spring and the servo cover into the case reverse servo pocket.
NOTE: Make sure that the servo piston is reinstalled with the same rod length as the one which was removed.
5. Using the handle of a hammer, depress the reverse servo piston and cover sufficiently to gain clear access to the retaining snap ring groove in the case. Install the snap ring.
6. Inspect the outer edge of reverse servo pocket for nicks or burrs which might have been raised during the removal or installation of the retaining snap ring.
7. Remove nicks or burrs with a "fine" honing stone and clean the effected surfaces thoroughly. Failure to do so may cause improper seating of the valve body separator plate to the hydraulic passages in the case and subsequent cross leakage.
8. Clean and inspect the valve body.
9. Position a new valve body gasket to the separator plate.
10. Install valve body guide Pins, Tool T8OL-77100-A or equivalent to the case. Position a new separator plate gasket to the valve body and case, making sure that the inner manual lever and inner TV lever are engaged.
11. Install and tighten (25) attaching bolts to 9-11 N.m (80-100 in-lbs).
12. Install and tighten the detent spring and attaching bolt to 9-14 N.m (80-120 in-lbs).
13. Position the throttle lever spring against the separator plate.
14. Remove the guide Pins T8OL-77100-A and install and tighten the remaining two valve body attaching bolts.
15. Using three dacron filter attaching bolts install the dacron filter and gasket to the valve body and tighten the attaching bolts to 9-14 N.m (80-120 in-lbs).
16. Clean the transmission oil pan and gasket surfaces thoroughly.
17. Using a new oil pan gasket, secure the pan to the transmission case. Tighten the attaching bolts to 8.0-13.5 N.m (6-10 ft-lbs).
18. Lower the vehicle and fill the transmission to the correct level with the specified fluid. Fluid - A/T
19. Adjust TV cable linkage as outlined in this Section. Adjustments