SkyTrak 6036 Service Manual - Manual (Page 234)

Section 9 Hydraulic System
9-84 Model 6036/6036T S/N 9B0500 thru 14833
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. 9.51. 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
e. Assembly
1. Install new O-ring (14, Fig. 9.50) 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 back-up 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 (3, Fig. 9.49) into position
on the mounting bracket.
2. Install capscrews (7) and lock washers (6) 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.
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.
The pressure at the brakes is 525 psi (36,2
bar). Do not open the bleeder without
holding tubing on the bleeder to prevent
releasing a jet of oil that could cause
personal injury.
3. While holding the tubing firmly on the bleeder,
open the bleeder with a suitable small wrench.
Have an assistant depress the brake pedal.
Close the bleeder when air bubbles no longer
appear in the oil. Release the brake pedal
and remove the tubing from the bleeder.
4. Repeat steps 2 and 3 for the brakes on the
other wheels.
5. Discard the oil which was collected in the
container.
6. Check level in reservoir and fill as described in
the Owners/Operators Manual.
BRAKE
BLEEDER
MA0721
Fig. 9.51 Brake Bleeder