JLG 740AJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121160 3-213
15. Allow all air to vent to atmosphere, then check compres-
sor oil level - top up if necessary. Check and correct any
leaks, tighten any loose fittings, check drive belt tension.
Normal Startup Procedure
1. Check compressor oil level - top up if necessary.
2. Air service valve (beside the compressor) closed.
3. Start the engine.
4. Compressor switch (in the platform) ON - compressor
should activate.
5. Allow the compressor to warm up for several minute
before operating.
Normal Shutdown Procedure
1. Close service valve and allow compressor to unload and
cool down (approx. 5 min.).
2. Position the compressor switch in the platform to OFF.
3. Shut down the engine.
Daily Operation
Before Starting:
1. Check compressor oil level.
2. Check for any leaks or loose bolts.
3. Check drive belt is tight.
After Starting:
1. Check pressure gauge for correct operating pressure.
2. Check for leaks.
General Maintenance
A good maintenance program is the key to long compressor
life. Below is a program that when adhered to, should keep the
compressor in top operating condition. However, it should be
understood that these intervals are for normal operation in a
good clean environment. More frequent inspections, oil
changes and general maintenance should be carried out in
dusty environments, high ambient temperatures or extended
light load conditions.
DO NOT REMOVE CAPS, PLUGS OR ANY COMPONENTS WHEN THE COMPRES-
SOR IS RUNNING OR PRESSURIZED. STOP THE COMPRESSOR AND RELIEVE ALL
INTERNAL PRESSURE BEFORE DOING SO.
AFTER INITIAL 50 HOURS
1. Change oil filter (Since initial oil filter will have collected
any foreign materials which have collected in manufac-
ture).
2. Check belt tension and alignment (majority of belt
stretch will occur during early operation hours, also be
sure to check alignment).
3. Check compressor oil for water or emulsion.
EVERY 500 HOURS (OR 6 MONTHS)
1. Change compressor oil and filter.
2. Change air filter (shorter intervals may be required if
dirty environment).
3. Check belt tension and alignment.
4. Blow out compressor cooler core.
5. Check all fittings and fastenings.
6. Test shutdown system.
EVERY 1000 HOURS (OR 1 YEAR)
1. Check safety circuit switches.
2. Check sump safety valve.
3. Replace spin-on coalescer (sooner if required).