Yale ERP15-20VT Service Manual page 15

Maintenance and Repair
Figure 15. Removing the Cap
5. Using a grind stone, slightly bevel the end of a 7/16
x 2 inch roll pin. Allow pin to cool.
6. Carefully position roll pin to piston. Drive roll-pin
into cavity of piston with a nylon faced hammer.
NOTE: It may be helpful to apply compressed air to the
service brake line port (as with removing the cap) AF-
TER the piston has been pulled to the top end of the
brake cylinder.
NOTE: Make note of the piston and seal orientation dur-
ing removal.
7. Pull roll-pin (and piston) from cylinder using pliers.
NOTE: Make note of the cylindrical pin orientation dur-
ing removal.
8. Remove cylindrical pin from beneath piston.
9. Inspect cylinder walls for pits, cracks, and other
damage.
NOTE: Install the cylindrical pin in the orientation noted
during removal.
10. Lightly lubricate cylindrical pin with multipurpose
grease and install into brake cylinder as noted dur-
ing removal.
NOTE: A new brake piston and new seal should be used
when repairing the brake cylinder assembly. Make sure
the new piston and new seal are oriented as noted when
removed.
11. Lightly lubricate new piston seal with multipurpose
grease and install in new brake piston as noted dur-
ing removal. See Figure 16.
12
1. SNAP RING
2. CAP
3. O-RING
Figure 16. Piston Seal Orientation
12. Install new brake piston (and seal) into brake cylin-
der.
13. Place spring into cavity in piston by hand.
14. Lightly lubricate new O-ring with multipurpose
grease and install on cap as noted during removal.
NOTE: Make sure the cap is oriented as noted when
removed.
15. Install cap into brake cylinder.
16. Press cap into cylinder, to expose snap ring groove,
and install snap ring on brake piston.
NOTE: It is recommended to verify the torque on the
transaxle cover capscrews before reinstalling the trac-
tion motor. See section Cover to Housing Seal.
17. Install brake and traction motor on transaxle and
install transaxle on lift truck. See section Install
Transaxle to Frame.
CAUTION
Make sure the lift truck is blocked at the same
height as with the drive tire installed to ensure the
proper fluid level reading.
18. Check transaxle fluid level. See section Fluid Level
Check.
19. Install drive tire and tighten lugs to 170 N•m
(125 lbf ft). Test lift truck for proper operation.
1300 YRM 1330
4. PISTON
5. SEAL
6. SPRING