JLG 740AJ Service Manual - Manual (Page 209)

SECTION 3 - CHASSIS & TURNTABLE
3121160 – JLG Lift – 3-157
15. Allow all air to vent to atmosphere, then check com-
pressor 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 - compres-
sor 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 pres-
sure.
2. Check for leaks.
General Maintenance
A good maintenance program is the key to long compres-
sor 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 tem-
peratures or extended light load conditions.
DO NOT REMOVE CAPS, PLUGS OR ANY COMPONENTS WHEN
THE COMPRESSOR IS RUNNING OR PRESSURIZED. STOP THE
COMPRESSOR AND RELIEVE ALL INTERN AL PRESSURE
BEFORE DOING SO.
AFTER INITIAL 50 HOURS
1. Change oil filter (Since initial oil filter will have col-
lected any foreign materials which have collected in
manufacture).
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).