SkyTrak 6036 Service Manual - Manual (Page 166)

9-53 Model 6036 S/N 9B0499 and Before
Section 9. Hydraulic System
g. Bleeding the Brake Lines
Bleed the brake lines very carefully as soon as the
brake valve is installed in the machine. Air in the
system will not allow the brakes to release prop-
erly and may severely damage them. Bleed the
brakes whenever there is reason to suspect that
air has entered the braking system.
1. Place the transmission in neutral, start the
engine and engage parking brake.
2. Install one end of an 18 to 24 inch (457 to 610
mm) length of transparent 1/4 inch (6 mm)
inside diameter tubing over the brake bleeder,
Fig. 9.31. Place the other end of this tubing in
a suitable transparent container which is
partially filled with hydraulic oil. The end of the
tubing must be below the oil level in the
container.
Warning !
2. Remove small scratches in the bore using
emery cloth of very fine grit. Use the emery
cloth with a rotary motion.
e. Assembly
1. Install new O-ring (14, Fig. 9.29) in the seat on
valve and ball assembly (15) and insert into
housing bore so that the seat end is located
on the plug end of the brake valve.
2. Install guide (16), spring (17), sleeve (18) and
washer (19) in the housing bore.
NOTE: It is desirable to install a new sleeve (18)
in all units. The sleeve is part of the valve repair
kit. Position the sleeve over the spring (17) and
up against the seat flange.
3. Insert new backup ring (21) and new cup (20)
inside end of plug (23). Note the order of
backup ring and cup.
4. Install new O-ring (22) on the plug and install
in housing (13).
5. Install new cup (11) and spring (12) on plunger
(10). Note that the cup lip should be facing
toward the plug (pressure) end of the brake
valve.
6. Insert assembled plunger into the housing
bore.
7. Install washer (9) in the housing bore.
8. Carefully install retaining ring (8) in housing
bore to avoid scratching the housing bore.
9. Install new O-ring (7) in housing bore.
10. Install springs (5 and 6), shim or shims (4) and
piston (3) in housing bore.
11. Install boot (2) and retaining ring (1) in housing
(16).
f. Valve Installation
1. Lower brake valve (9, Fig. 9.28) into position
on the mounting bracket.
2. Install capscrews (6), lock washers (5) and
jam nuts (4) to secure valve.
3. Remove plugs or caps as required and
connect the tagged hydraulic lines to the brake
valve.
4. Install lower panel (2) with capscrews and lock
washers (1) after bleeding and checking brake
system.
Fig. 9.31 Brake Bleeder
BRAKE
BLEEDER
MA0721
The pressure at the brakes is 525 ± 25 psi
(36,2 ±1,7 bar). Do not open the bleeder
without holding tubing on the bleeder to
prevent releasing a jet of oil that could cause
personal injury.