Snorkel LX41 Electric-sn4022+ - Manual (Page 57)

Section 2 - Service and Repair Hydraulic Brakes
067448-003 LX31/LX41 Electric Work Platform Page 2-19
B RAKE S EAL R EPLACEMENT
Figure 2-16: Brake Assembly
1. With shaft protrusion downward, remove
capscrews (21) and washers (20) from
brake assembly.
2. Remove power plate (19) from housing (1).
Remove gasket (2).
3. Remove piston (14) from power plate (19)
by introducing low pressure air [1,0 bar
(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 piston.
5. Clean piston (14) and power plate (19)
assemblies with solvent. Inspect the seal-
ing surfaces of the piston (14) and power
plate (19). Inspect seal grooves in the pis-
ton. 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
assembly.
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 [3 mm (0.120 in.)] 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
capscrews 65 - 80 N-m (50 - 60 ft.-lbs.).
I NSTALLATION
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 205 N-m (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 energize brake hydraulic system.
8. Check for leaks and bleed air out of brake hydraulic 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 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