First and Reverse Brake

COMPONENTS





DISASSEMBLY OF FIRST AND REVERSE BRAKE



1. REMOVE ASSEMBLED BEARING AND RACE FROM TRANSMISSION CASE




2. CHECK FIRST AND REVERSE BRAKE PISTON MOVING
Make sure the first and reverse brake piston moves smoothly when applying and releasing the compressed air into the transmission case.




3. COMPRESS PISTON RETURN SPRING AND REMOVE SNAP RING
a. Set SST on the spring retainer, and compress the return spring.
SST 09350 - 30020 (09350 - 07050)
b. Remove the snap ring with snap ring pliers.

4. REMOVE PISTON RETURN SPRING




5. REMOVE NO.2 FIRST AND REVERSE BRAKE PISTON
a. Hold the No.2 first and reverse brake piston by hand, apply compressed air to the transmission case to remove the No.2 first and reverse brake piston.
b. Remove the No.2 first and reverse brake piston.
If the piston does not pop out with compressed air, lift the piston out with needle-nose pliers.




6. REMOVE REACTION SLEEVE
Insert SST behind the reaction sleeve and gradually lift it out of the transmission case.
SST 09350 - 30020 (09350 - 07080)




7. REMOVE NO.1 FIRST AND REVERSE BRAKE PISTON
Insert SST behind the No.1 brake piston and gradually lift it out of the transmission case.
SST 09350 - 30020 (09350 - 07090)




8. REMOVE SECOND BRAKE FROM OUTPUT SHAFT




9. REMOVE DISCS, PLATES AND FLANGE FROM OUTPUT SHAFT

7M-GE: One flange, six plates and six discs
7M-GTE: One flange, seven plates and seven discs

INSPECTION OF FIRST AND REVERSE BRAKE



Check that the sliding surface of disc is not worn or burnt.
If the disc is worn or burnt, replace all discs. Then check that the sliding surfaces of plate and flange are not worn or burnt. If necessary, replace them.

ASSEMBLY OF FIRST AND REVERSE BRAKE



1. INSTALL FLANGE, DISCS AND PLATES
a. Install the flange, facing the rounded edge rearward.
b. Install in order:

7M-GE: D-P-D-P-D-P-D-P-D-P-D-P
7M-GTE: D-P-D-P-D-P-D-P-D-P-D-P-D-P




2. INSTALL SECOND BRAKE TO OUTPUT SHAFT




3. ASSEMBLE NO.1 FIRST AND REVERSE BRAKE PISTON
a. Coat three new O-rings with ATF.
b. Install the two O-rings on the No. 1 piston.
c. Install the O-ring on the reaction sleeve.
d. Install the No. 1 piston to the reaction sleeve.




4. INSTALL NO.1 FIRST AND REVERSE BRAKE PISTON WITH REACTION SLEEVE TO NO.2 FIRST AND REVERSE BRAKE PISTON
a. Coat a new O-ring with ATF and install it on the No. 2 piston.
b. Install the No.1 piston with reaction sleeve onto the No.2 piston.




5. INSTALL NO.2 WITH NO.1 FIRST AND REVERSE BRAKE PISTONS INTO TRANSMISSION CASE
a. Align the teeth of the No.2 piston into the proper grooves.
b. Being careful not to damage the O-rings, press in the No.2 with No.1 first and reverse brake pistons into the transmission case.




6. PLACE PISTON RETURN SPRING ONTO NO.2 PISTON




7. COMPRESS PISTON RETURN SPRING AND INSTALL SNAP RING IN GROOVE
a. Set SST as shown, and compress the return spring with SST.
SST 09350 - 30020 (09350 - 07050)
b. Install the snap ring with snap ring pliers. Be sure the end gap of the snap ring is not aligned with the spring retainer claw.




8. CHECK FIRST AND REVERSE BRAKE PISTON
Make sure the first and reverse brake piston moves smoothly when applying and releasing the compressed air into the transmission case.




9. INSTALL ASSEMBLED BEARING AND RACE
a. Coat the assembled bearing and race with petroleum jelly.
b. Install the assembled bearing and race facing the bearing side upward.

NOTE: Assembled bearing and race diameter
Inside diameter: 39.2 mm (1.543 in.)
Outside diameter: 57.7 mm (2.272 in.)