JLG 450AJ Service Manual - Manual (Page 39)

SECTION 2 - PROCEDURES
3120869 – JLG Lift – 2-23
Placing Pump Back Into Service
1. If shop test stand is available, the following proce-
dure for testing rebuilt pumps is recommended:
a. Mount pump on test stand making sure that the
proper level of clean oil is available in the reser-
voir. Check suction line for leaks and obstruc-
tions.
b. Start pump and run for three minutes at zero
pressure.
c. Intermittently load pump to 34.5 Bar (500 psi) for
three minutes.
d. Intermittently load pump to 69 Bar (1000 psi) for
three minutes.
e. Intermittently load pump to 138 Bar (2000 psi)
for three minutes.
f. Remove pump from test stand and check for
freeness of drive shaft. Check pump for signs of
external leakage.
2. If shop test stand is not available, the following pro-
cedure for testing rebuilt pumps is recommended:
a. For engine driven pumps, mount pump on
equipment and run pump at 1/2 engine speed at
zero pressure for three minutes.
b. By operating control valve, build pressure inter-
mittently for three minutes.
c. Increase engine speed to full throttle and build
pressure intermittently for three minutes.
d. Stop engine and check pump for external leaks.
2.12 SWING BEARING
Turntable Bearing Mounting Bolt Condition
Check.
NOTE: This check is designed to replace the existing bear-
ing bolt torque checks on JLG Lifts in service. This
check must be performed after the first 50 hours of
machine operation and every 600 hours of machine
operation thereafter. If during this check any bolts
are found to be missing or loose, replace missing or
loose bolts with new bolts and torque to the value
specified in the torque chart, after lubricating the bolt
threads with loctite #271. After replacing and
retorquing bolt or bolts recheck all existing bolts for
looseness.
Check the frame to bearing. Attach bolts as follows:
1. Elevate the fully retracted boom to 70 degrees (full
elevation).
2. At the positions indicated on the figure titled Swing
Bearing Tolerance Boom Placement. Try and insert
the 0.0015" feeler gauge between the bolt head and
hardened washer at the arrow indicated position.
3. Assure that the 0.0015" feeler gauge will not pene-
trate under the bolt head to the bolt shank.
4. Swing the turntable 90 degrees, and check some
selected bolts at the new position.
5. Continue rotating the turntable at 90 degrees inter-
vals until a sampling of bolts have been checked in
all quadrants.
Check the turntable to bearing. Attach bolts as follows:
1. Elevate the fully retracted boom to 70 degrees (full
elevation).
2. At the positions indicated in the figure below, try and
insert the 0.0015" feeler gauge between the bolt
head and hardened washer at the arrow indicated
position.
3. Lower the boom to horizontal and fully extend the
boom.
4. At the position indicated on Figure 2-30. try and
insert the 0.0015" feeler gauge between the bolt
head and hardened washer at the arrow indicated
position.
.0015" Feeler Gauge
Figure 2-19. Swing Bearing Feeler Gauge Check