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Champion Operating Instructions & Parts Manual
Champion Two-Stage Air
Compressor Pumps
Operation (Continued)
IMPORTANT: This compressor has a
maximum operating pressure of 175
PSIG. Do not alter pressure settings on
control components above this limit.
CONSTANT SPEED UNLOADING
& PILOT VALVE (MODEL 3Z181C
E
ONLY)
N
This compressor is equipped with head
G
valve unloaders. The pilot valve is
L
designed to act as an automatic ON and
I
OFF air switch. When in the ON
S
position it allows air to flow from the tank
H
through the valve to the compressor
head unloader mechanism, thus
actuating it. In the OFF position this
valve stops the flow of air through the
valve and releases the pressure in the
line to the head unloader.
The pilot valve works as follows: Tank
air pressure acts on the bottom of the
valve. When pressure is great enough to
overcome spring force holding valve
down on lower seat, it lifts off seat and
allows air to flow around valve and out
through side opening in pilot valve.
When valve lifts off lower seat it moves
up and seats on upper seat where it is
held by tank pressure. When pressure in
tank and on valve drops, spring forces
valve back down on lower seat. Air in
line to device being actuated can then
escape through upper seat and out vent
hole. The pressure at which the pilot
valve is ON or OFF is controlled by the
spring which has been installed at the
factory. A small adjustment can be made
in the field by changing the spring force
by compressing the spring more or less
with the adjusting screw provided on the
pilot valve.
COMPRESSOR PILOT VALVE
PRESSURE ADJUSTMENT
Refer to Figure 3.
Proceed with the following instructions
while compressor is running:
1.
Loosen locknut (Ref. No. 4) and
back off several turns. Do not turn
differential adjuster (Ref. No. 3).
2.
Check reading on the tank pressure
gauge. Set the compressor
maximum pressure at 170 PSIG.
Turn threaded cap (Ref. No. 1)
clockwise to increase pressure or
counterclockwise to decrease
differential pressure.
3. After pressure is set, tighten locknut
(Ref. No. 2). Be careful not to move
threaded cap (Ref. No. 1).
COMPRESSOR PILOT VALVE
DIFFERENTIAL PRESSURE
ADJUSTMENT
Proceed with the following instructions
while compressor is running:
1. Loosen locknut (Ref. No. 2) and back
off several turns.
2. Check reading on the tank pressure
gauge. Set the pressure to 30 PSIG
differential (unload at 170 PSIG
reload at 140 PSIG). Turn nut (Ref.
No. 3) clockwise to increase
differential pressure or
counterclockwise to decrease
differential pressure.
3. After pressure is set, tighten locknut
(Ref. No. 2). Be careful not to move
nut (Ref. No. 3).
Pilot Valve
Assembly Part No.
Pressure Range
M2855
75 - 95 PSIG
M2854
90 – 120
M2853
140 - 170
B-980-B
(Ref. Drawing)
Figure 3 – Adjusting Pilot Valves
Maintenance
To obtain reliable and satisfactory
service, this unit requires a consistent
preventive maintenance schedule.
A maintenance schedule form is
included to aid in keeping the proper
records.
4
3Z180C and 3Z181C
Before performing
any maintenance function, switch
main disconnect switch to OFF
position to assure no power is
entering unit. Lock out or tag out all
sources of power. Be sure all air
pressure in unit is relieved. Failure to
do this may result in injury or
equipment damage.
DAILY MAINTENANCE
1. Check oil level of both compressor
and engine if so equipped. Add
quality lubricating oil as required.
See section on "Compressor Oil
Specifications".
2. Drain moisture from tank by opening
tank drain cock located in bottom of
tank. Do not open drain valve if tank
pressure exceeds 25 PSIG.
3. Turn off compressor at the end of
each day's operation. Turn off power
supply at wall switch.
WEEKLY MAINTENANCE
1. Clean dust and foreign matter from
cylinder head, motor, fan blade, air
lines, intercooler and tank.
2. Remove and clean intake air filters.
Do not exceed 15
PSIG nozzle pressure when cleaning
element parts with compressed air.
Do not direct compressed air against
human skin. Serious injury could
result. Never wash elements in fuel
oil, gasoline or flammable solvent.
3. Check V-belts for tightness.
The V-belts must be tight enough to
transmit the necessary power to the
compressor. Adjust the V-belts as
follows:
a. Remove bolts and guard to access
compressor drive.
b. Loosen mounting hardware which
secures motor to base. Slide motor
within slots of baseplate to desired
position.
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