Gradall 534B (9103-1390) Service Manual - Manual (Page 76)

PRESSURE BLEEDING
INSTRUCTIONS
Master Cylinder must be mounted to
power assist section.
Fill reservoir with proper fluid.
Be certain all fittings are tight to avoid
leaking.
DO NOT DEPRESS PEDAL.
Connect pressure bleeder into
reservoir adapter. Recommended
bleeding pressure is 2.07 bar
(30 psi) maximum. NOTE: Make
sure to use correct pressure
bleeder for type fluid used in
system.
Open bleeder screw closest to
master cylinder outlet. Most of the
air contained in the system will
escape by this route. Close bleed-
er screw.
Continue to the next bleeder
screw and so on. At each point
when air bubbles disappear close
bleeder screw.
Remove pressure bleeder.
Open bleeder screw at master
cylinder. Actuate cylinder to re-
move any residual air. Tighten
bleeder screw before permitting
pedal to return.
Actuate pedal several times. If
pedal is spongy, check for system
leaks and repeat bleeding process.
Form No. 81-460-159
BLEEDING PROCEDURES
NOTE
Use only proper fluid specified by vehicle manufacturer. Never reuse fluid that has been drained from the system.
Be sure that you maintain a high level of fluid in the reservoir during and after the entire bleeding process.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
BENCH BLEEDING
INSTRUCTIONS
(Refer to Figure 5)
This process can be done in a
bench vise or on the vehicle with
master cylinder mounted to power
assist section.
Remove master cylinder filler cap
assembly.
Connect a length of tubing to an
outlet port and immerse the other
end below the fluid level in the
master cylinder reservoir. Keep
reservoir fluid within 12.7 mm
(.50") of inside reservoir top.
Actuate master cylinder piston
with a smooth object large enough
to hold the small internal piston
from coming out. Slowly stroke
and release master cylinder
piston. SEE CAUTION BELOW.
Repeat until air bubbles in reservoir
have ceased.
Remove tubing. This should be
done quickly so the loss of fluid
will be minimized.
If cylinder was bench bled in a
vise, it must now be attached
securely to the power assist
section and mounted on vehicle.
Finish all plumbing connections
before continuing to step 7. 1.
2.
3.
4.
5.
6.
Bleed remaining air from system
by depressing brake pedal and
opening bleeder fitting closest to
master cylinder. Close bleeder
fitting before brake pedal is re-
leased. Continue to next bleeder
port. In all cases the bleeder fit-
tings must be closed before the
brake pedal is released or air will
be pulled in through the bleeder
and ingest unwanted air in the
system.
Fill reservoir to within 12.7 mm
(.50") of top. Install filler plug and
torque 33.9-40.7 Nm (25-30 (lbs-ft).
Be certain all fittings are tight to
avoid any leaking.
Actuate pedal several times. If
brake pedal feels spongy, check
for system leaks and repeat
bleeding process.
CAUTION
Care must be taken so as not to over
stroke this cylinder. The cylinder does
not incorporate a piston stop. Over
stroking this cylinder may cause it to
leak from push rod end of cylinder.
Maximum recommended stroke for
this cylinder is 31.8 mm (1.25").
7.
8.
9.
10.
!!!!!
Output
Reservoir
FIGURE 5
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printed material. MICO can accept no responsibility for errors from unintentional oversights that
may exist. Due to a continuous program of product improvement, both materials and specifications
are subject to change without notice or obligation.
MICO is a registered trademark of MICO, Incorporated. MICO is registered in the U.S. Patent and Trademark office as well as in Canada, Great Britain, South Korea and Australia.
MICO, Incorporated
1911 Lee Boulevard (Zip Code 56003-2507)
P.O. Box 8118 / North Mankato, MN U.S.A. 56002-8118
( (507) 625-6426 Facsimile (507) 625-3212
MICO West Division
701 East Francis Street (Zip Code 91761-5514)
P.O. Box 9058 / Ontario, CA U.S.A. 91762-9058
(
(909) 947-4077 Facsimile (909) 947-6054
Revised 3/98 Printed in U.S.A