SB80 Work Platform - European 3-13
M
AINTENANCE
Section
3.13
3.13 B
RAKE
S
EAL
R
EPLACEMENT
1. With shaft protrusion downward remove cap-
screws (21) and washers (20) from brake.
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 grooves of piston.
5. Clean piston (14) and power plate (19) assem-
blies with solvent. Inspect sealing surfaces of pis-
ton (14) and power plate (19). Inspect seal
grooves in piston. Replace brake assembly if
damaged or scratched deeply. Lubricate piston
(14), power plate (19), and seals (15, 16, 17, &
18) with clean hydraulic oil before 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 3,05 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 cap-
screws 68 - 81 Nm (50 - 60 ft.-lbs.).
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 hoses to drive motor and hoses to the
brake.
4. Start engine and provide pressure to brakes by
moving drive joystick fractionally away from the
center without actually driving machine and bleed
brakes.
Figure 3-14: Brake Assembly
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