Gradall 534B (9020-7317) Service Manual - Manual (Page 128)

In a safe area, drive the Gradall/Loed Materials
Handler and test the inching brake. If it is properly
adjusted you should be able to move the Handler
very slowly, and under full control. Attempt to inch
while turning a sharp turn. If the unit does not
respond smoothly, test and adjust as follows:
1.
2.
3.
4.
5.
GRADALL
LOED MATERIALS HANDLER
534B
TESTING AND ADJUSTING
HOW TO TEST AND ADJUST
THE INCHING MECHANISM
Make sure the service brakes are properly
adjusted.
Install a 0-5000 psi test gage in the tube coming
from the # I pump section.
Install a 0-2000 psi test gage in the test port
located in the front brake lines. Bleed the brake
lines.
Depress the foot pedal to full brake application.
It should be 3/4" to 1" from the floor. Adjust the
brake linkage, if needed.
Check the low torque inching switch adjustment.
It is located under the inching control assembly,
under the seat mounting plate. This switch should
disengage with the first 1/2" to 3/4" of brake pedal
6.
7.
8.
9.
10.
11.
You are now ready to test the inching
components:
A.
B.
C.
D.
At the same time the gage on the #1 Pump tube
should read 1200 psi. If over or under 1200 psi,
mechanical adjustment of the inching linkage is
required.
If the test gage reading is over 1200 psi, tighten
the adjusting nut to add compression to the
spring.
If the test gage reading is under 1200 psi, loosen
the adjusting nut to have less compression to the
spring. Secure the jam nut after adjustment.
Note: This adjustment can be made by the
operator as he holds the brake pressure at 425 psi.
If unable to get 1200 psi pressure, repeat the
pressure test again, making sure all inching brake
linkage has smooth movement. Also too high, or
too low operating temperature of the torque
converter/transmission will cause pressure to
vary.
After adjustment, test the Materials Handler to
make sure it inches correctly. Remove gages and
Start engine and depress the services brake
foot pedal completely down.
Place gear shift in first gear forward with the
rear wheels straight.
Increase engine power to full rpm.
Back off on the brake pedal until the brake
line gage reads 425 psi. HOLD PEDAL IN
THIS POSITION.
8