JLG 150HAX Service Manual - Manual (Page 77)

SECTION 3 - CHASSIS & TURNTABLE
3120817 – JLG Lift – 3-39
e. Release footswitch and stop machine.
f. Seal ramp pot adjustment screw with a drop of
enamel paint to prevent maladjustment due to
vibration.
g. Install controller and secure machine.
2. Swing Controller.
a. Using all applicable safety precautions, start
machine and ensure that adequate space is
available to maneuver machine.
b. Fully extend boom at horizontal.
c. Position ENGINE SPEED switch to LOW.
d. Operate SWING controller at full speed to the left
and then quickly move controller to the full
speed RIGHT position. The platform should
slow, stop and then swing right in one smooth
and continuous operation.
e. If control valve initiates swing right motion before
platform momentum is stopped, the ramp poten-
tiometer adjust screw should be rotated clock-
w i s e t o i n c r e a s e r a m p t i m e a n d t h e t e s t
repeated.
f. If after operating SWING function as described
in step (d), the platform stops moving to the left
and the spring action of the boom tends to ini-
tiate the swing right motion before the control
valve starts to operate, the ramp pot adjust
screw should be rotated counterclockwise to
decrease ramp time.
g. Repeat the test in both swing directions.
h. Release footswitch and stop machine.
i. Seal ramp pot adjustment screw with a drop of
enamel paint to prevent maladjustment due to
vibration.
j. Install controller and secure machine.
3.13 PUMP COUPLING CONVERSION
PROCEDURES
The following procedures are provided to assist in the con-
version from a solid pump coupling to a Lovejoy or Hayes
pump coupling.
Lovejoy Coupling
3. Separate coupling disc and hub and align plastic
disc on flywheel with webbing facing flywheel. Install
attaching bolts and lockwashers and torque bolts to
30 ft. lb. (41 Nm).
4. Attach pump mounting plate adaptor to bell housing
of engine and secure with bolts and lockwashers.
5. Slide coupling hub onto pump shaft bottoms out on
roll pin (located inside hub). Secure hub onto shaft
by torquing torque screws to 22 ft. lb. (30 Nm).
6. Insert coupling hub (now affixed to pump shaft)
through pilot bore in pump mounting plate. Align
coupling hub and disc, push pump into position and
secure with bolts and lockwashers.
1. Coupling
2. Bolt
3. Lockwasher
4. Pump Adapter
5. Bolt
6. Lockwasher
Figure 3-26. Lovejoy Coupling