Table of Contents
Advertisement
RANGER AIR 260MPX
®
PROBLEMS
(SYMPTOMS)
Excessive oil in the air.
Excessive moisture in the air.
Output pressure too high.
If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your
Lincoln Authorized Service Facility for technical troubleshooting assistance before you proceed.
WWW.LINCOLNELECTRIC.COM/LOCATOR
POSSIBLE
CAUSE
4. If the engine rpm is dropping, verify the engine
is functioning properly.
1. Machine is not on a level surface.
2. Compressor oil level too high.
3. Coalescing filter plugged or damaged.
4. Scavenger system not operating.
1. Water may have accumulated in an auxiliary
air tank.
1. The clutch relay failed.
2. The clutch is not releasing.
3. Faulty pressure sensor.
3. Faulty proportional valve
E-6
TROUBLESHOOTING
RECOMMENDED
COURSE OF ACTION
5. One of the coils is leaking in it's
closed state - to diagnose, energize
the N.O. blowdown valve (smaller
coil) and apply 100psi to the
combination valve manifold inlet. If
air is leaking to the outlet, one of the
valves are leaking. Replace full valve
assembly.
1. The machine must be within 15° of
level.
2. Drain excess oil.
3. Replace the coalescing filter.
4. Air/oil separator filter is over
saturated or has standing oil level.
This would be caused by a
separator filter that has not been
changed well beyond its service
interval, or a blocked/clogged
scavenge oil return orifice or filter.
Remove and replace air/oil
separator filter. Remove and
inspect 0.030" scavenge return
orifice and mesh filter (ultrasonically
welded to orifice inlet). If the orifice
is blocked, or the mesh filter is
collapsed or damaged, replace.
1. Drain water from the air tank.
1. Verify the clutch relay opens and
closes.
2. Turn the machine off by placing the
OFF/RUN/START switch in the OFF
position. Allow at least 1 minute for
air pressure to dissipate. Remove
tension from the belt. Verify the
pulley on the clutch spins easily.
3. At 0 psi, the voltage at pins B and
C is 0.5 VDC. At 150 psi, the
voltage at pins B and C is 2.5VDC.
4. Output pressure too high = N.C.
proportional valve not opening
when it is supposed to. Assuming
outlet pressure transducer is
reading correctly.
5. Proportional valve coil (larger coil)
is faulty, preventing it from opening
when triggered. Measure coil
resistance across 2 pins, if Open
loop or very high (KΩ or higher) coil
is faulty. Reference coil at 20°C
resistance = 21Ω , note resting coil
resistance will increase as the
valve heats up during machine
operation.
Advertisement
Table of Contents
