Service Manual Instruction Manual

SECTION 4 - BOOM & PLATFORM
3121171 – JLG Lift – 4-113
Bleeding After Installation
NOTE: Bleeding will be necessary if excessive backlash is displayed
after the actuator is installed. To do this, bleeder valves
must be installed in the actuator at the locations shown
below. The following steps are recommended when a mini-
mum of two gallons (8 liters) is purged.
1. Connect a 5 foot (1.5 m) long 3/16" inside diameter, 5/
16" outside diameter clear vinyl drain tube to each of
the two bleeder valves. Secure the tubes in place with
hose clamps.
2. Place the end of the tubes in a clean 5 gallon (19 L) con-
tainer to collect the purged oil. The oil can be returned
to the reservoir when the procedure is complete.
3. Open both bleeder valves 1/4 turn. Using the hydraulic
system, rotate the platform to the end of rotation and
maintain hydraulic pressure. Oil with small air bubbles
should be seen flowing through the tubes. Allow 1/2
gallon (2 L) of oil to be purged from the actuator.
4. Keep the bleeder valves open and rotate the platform in
the opposite direction to the end of rotation. Maintain
hydraulic pressure until an additional 1/2 gallon (2 L) of
oil is pumped out.
5. Repeat steps 3 and 4. After the last 1/2 gallon (2 L) of oil
is purged, close both bleed nipples before rotating away
from the end of rotation.
Figure 4-56. Jib Alignment Timing Marks
ALIGN TIMING MARKS IN ROTATOR WITH
TIMING MARKS IN PIVOT AS SHOWN
JIB WILL BE 35 DEGREES OUT OF LINE
WITH THE BOOM WITH ROTATOR CENTERED
REALIGN THE JIB WITH THE BOOM AFTER
ALL HARDWARE IS ASSEMBLED