JLG 740AJ, Руководство по обслуживанию и ремонту

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SECTION 3 - CHASSIS & TURNTABLE
3121160 3-215
Coalescer (Air/Oil Separator) Replacement
This is a spin-on, throw away type unit. Before attempting to
change ensure all pressure is relieved from the system. Change
in accordance with Maintenance Guidelines. If oil carryover
into the service line occurs and the oil scavenge return line
scavenge shows little or no oil return, then change the ele-
ment. Verify receiver is not over full.
USE ONLY ORIGINAL EQUIPMENT COALESCER ELEMENT TO ENSURE PRESSURE
RATING AND PERFORMANCE IS SATISFACTORY.
REMOVAL:
1. Remove old element (use strap wrench if required) by
turning anti-clockwise and discard as appropriate and in
accordance with any pertinent regulations.
REPLACEMENT:
1. Apply a light film of oil to the seal surface on the new
element.
2. Screw element on clockwise until it seats on the head,
rotate an additional 3/4 turn (by hand). Take care not to
damage element.
3. Start up and check for leaks.
Air Filter Replacement
DO NOT replace with compressor in operation. If environment
is dirty or dusty an earlier change out may be required. To
ensure correct filtration use only original equipment filters.
REMOVAL:
1. Unscrew the wing nut on top of the air filter and remove
filter cover.
2. Discard filter as appropriate and in accordance with any
pertinent regulations.
REPLACEMENT:
1. Clean cover and any dirt inside filter housing taking
extreme care that no dust/dirt particles reach the air
intake of the compressor.
2. Fit new element inside housing.
3. Replace lid and tighten wing nut on top of air filter
assembly.
4. Test run and functional test.
Belts - Tightening and Replacement
Correct tensioning and alignment is important for belt life,
bearing life and power transmission.
Correct tensioning and alignment was provided at time of
shipment from the factory. However, since maximum belt
elongation will occur within the first 50 hours of operation (Of
new belts), their tension should be checked several times dur-
ing this period and corrected as required. The belts should
thereafter be checked periodically in order to obtain maxi-
mum life and performance.
NOTE: To avoid possible belt damage, never force belts over the
sheaves. Oil spilled or splashed onto the belts in any quan-
tity will cause slippage and severely reduce belt life - take
care when filling compressor oil.
REPLACING/TIGHTENING V-BELTS:
1. Loosen slightly the bolt at the base of the hydraulic
motor mounting bracket. This will allow the hydraulic
motor to be moved in or out to tighten or loosen the
belts.
2. Back off adjusting bolt lock nut. Screw the adjusting bolt
clockwise to tighten belt or anti clockwise to loosen
belts.
3. After adjustments have been made, tighten base bolt to
insure no further movement.
TENSION DATA
Deflection at center of belt span 0.25 in. (6.35 mm), with a
force of 4 pounds (1.8 kg).
Pulley alignment is set at factory and shouldn’t need to be
adjusted, if it is found necessary to adjust the pulley align-
ment, this is done by loosening the four bolts that hold down
the base plate to the frame and adjust per following instruc-
tions.
Ensure pulleys are aligned by using a long straight edge which
will span both pulleys. Position the straight edge on the sides
of the pulleys, if they are in-line there should be no gaps
between the straight edge and the pulleys (for the full contact
distance across each pulley side), adjust as necessary to get
correct alignment and tension.
It may be necessary to repeat and check several times before
both tension and alignment are satisfied.