LX31/41 Electric Work Platform
3-15
M
AINTENANCE
Section
3.13
Brake Seal Replacement
Refer to Figure 3-18.
1. With shaft protrusion downward remove cap-
screws (21) and washers (20) from brake assem-
bly.
2. Remove power plate (19) from housing (1).
Remove the gasket (2).
3. Remove piston (14) from power plate (19) by
introducing low pressure air (15 psi) into the
hydraulic inlet. Make sure piston is not pointed at
anyone.
4. Remove o-rings (16 & 18) and backup rings (15 &
17) from inner and outer diameter grooves of pis-
ton.
5. Clean piston (14) and power plate (19) assem-
blies with solvent. Inspect the sealing surfaces of
the piston (14) and power plate (19). Inspect seal
grooves in the piston. Replace brake assembly if
they are damaged or scratched deeply. Lubricate
piston (14), power plate (19), and seals (15, 16,
17, & 18) with clean hydraulic oil prior to assem-
bly.
6. Install the backup rings (15 & 17) and o-rings (16
& 18) into the seal grooves in the piston.
7. Install piston into power plate using a shop press.
Be careful not to damage the seals during
assembly. Center cutouts in piston with torque pin
holes in the power plate. Press piston to a depth
no less than flush, but not exceeding 0.120”
(3mm) below the surface of the power plate at
cutouts in piston. This depth is critical. The brake
will not hold if it is exceeded.
8. Install gasket (2).
9. Install power plate/piston assembly (14 & 19) to
housing (1) using capscrews (21) and washers
(20). Tighten sequentially, one turn at a time, to
press the two assemblies together. Torque cap-
screws 50 - 60 ft.-lbs. (68 - 81 N-m)
Installation
1. Coat output shafts of brake and drive motor with
high pressure molybdenum grease and install
gasket (22) and brake onto torque hub.
2. Install gasket (22) and drive motor. Align holes
and install the two cap screws and lock washers.
3. Reinstall cables to drive motor and hoses to the
brake.
4. Install the wheel. Torque the wheel nuts to 150 ft.
lbs.
5. Remove the jack stands and lower chassis to the
ground.
6. Position chassis switch to parking brake release
position. Alarm will sound.
7. Depress the electric motor start switch to ener-
gize brake hydraulic system.
8. Check for leaks and bleed air out of brake hydrau-
lic system using bleed valve located on brake
housing.
1. Housing
2. Gasket
3. Ball Bearing
4. Retaining Ring
5. Oil Seal
6. Spring Retainer
7. Spring, Compression
8. Shaft
9. Pin, Torque
10. Primary Disk
11. Spring, Compression
12. Rotating Disk
13. Stationary Disk
14. Piston
15. Backup Ring
16. O-ring
17. Backup Ring
18. O-ring
19. Power Plate
20. Washer
21. Capscrews
22. Gaskets
Seal Kit (068569-000) Includes:
Item
Description
Quantity
2
Gasket
1
15
Backup Ring
1
16
O-ring
1
17
Backup Ring
1
18
O-ring
1
22
Gaskets
2
Figure 3-18: Brake Assembly
Содержание LX31
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