SECTION 4 - BASIC HYDRAULIC INFORMATION & SCHEMATICS
3121788
4-17
4.10 TOWING
It is not recommended to tow this machine except in
the event of an emergency such as a machine malfunc-
tion or total machine power failure. However, provisions
have been made for extreme cases.
Hydraulic Brake Release for Towing
CAUTION
CHOCK WHEELS OR SECURE MACHINE WITH TOW VEHICLE.
1.
At the ground control station turn power off by
pressing the Emergency Stop switch.
2.
Open the right side compartment door and the
find main hydraulic manifold control valve.
3.
Perform the following to set the drive motor
control valve to tow mode. On the drive control
valve locate the tow mode needle valve knob
(1)
, Screw out the valve until it stops..
4.
On the main valve body, to release the brakes,
push the
BLACK brake override button
(2)
in,
(there is a detent which will hold the valve in
place).
5.
Pump the RED Knob
(3)
until pressure builds,
approximately 5 to 10 strokes. The brakes should
now be released.
6.
After towing is complete, release the BLACK
brake override button
(2)
and screw the tow
mode needle valve knob
(1)
all the way in to
reset the hydraulic brake. Chock the machine
wheels.
4.11 PRESSURE SETTING PROCEDURE
Install a pressure gauge capable of measuring 4000 psi
(276 bar) at the MP port of the main control valve. (Refer
to Figure 4-8.)
NOTE:
Refer to Section 5 for more information on using the
JLG handheld analyzer and switching between
access levels.
Main Relief
1.
Attach the Analyzer at the ground controls. Turn
on the machine.
2.
Press the right arrow key and scroll to ACCESS
LEVEL. Press ENTER.
3.
Use the arrow keys to enter the password for
ACCESS LEVEL 1 (33271). After entering the pass-
word, press ENTER.
4.
Press the right arrow key to scroll to the PERSON-
ALITIES menu. Press ENTER.
5.
Press the right arrow key to scroll to the PERSON-
ALITIES: LIFT menu. Press ENTER.
Figure 4-14. Hydraulic Brakes - Manual Disengage
(Inside Right Side Compartment Door)
3
2
1
MAF10660
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