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11
Airless Paint Systems
Operating Instructions and Parts Manual
www.chpower.com
Service (Cont.)
with a wrench since this could result in
breaking the shaft.
NOTE: It is recommended that you
change the valve seat and valve ball at
the same time.
REPLACING VALVE SPRING UNIT
Kit #3-007
Parts Needed: 3 Tip Washers, 1 Valve
Seat, 1 Valve Ball Holder, 1 Valve
Spring Unit
1. Repeat dismantling procedure as
outlined above under Steps 1
through 3.
2. Unscrew nut, remove retainer with
retainer pins and push shaft of the
valve spring unit out of the gun
head.
3. Clean gun head bore with solvent
and small brush. Do not use any
sharp objects to scrape away dried
paint, as they would cause leakage
around the seal.
Reassembling is done in reverse
sequence.
IMPORTANT: When reassembling,
install valve spring unit with spring
loose.
Push firmly into gun head by hand.
Install retainer pins, retainer, and nut
loosely onto valve spring unit. By hand,
turn front of valve spring unit
clockwise, tightening the valve spring
unit until you feel a positive stop. At
that point, continue tightening the
valve spring another 1/8 turn,
expanding the Teflon seals against
body of gun.
Do not tighten
valve spring beyond
1/8 turn, as doing so can break the
valve spring unit shaft. Continue
reassembly and adjustment as
described above.
FLUID PUMP
NOTE: Check the Troubleshooting
NOTICE
Chart on page 14 before disassembling
the Fluid Pump.
FLUID PUMP DISCONNECT
1. Flush out the material you are
spraying, if possible.
2. Follow the "Pressure Relief
Procedure" on page 3.
3. Remove the suction tube assembly
from the paint pump by unscrewing
the suction nut. Disconnect sensor
assembly by holding sensor with
7/8" wrench and unscrewing swivel
connector with an 11/16" wrench.
4. Move the piston rod to its lowest
stroke position by rotating the
motor fan or by cycling rod to
lowest position.
5. Unscrew the two screw from cover
assembly.
6. Remove retaining ring. Slide sleeve
down off crosshead assembly
Remove pin out of crosshead
allowing removal of fluid pump
from unit.
FLUID PUMP REINSTALLATION
1. Loosen packing nut and extend
piston rod to its upper position in
paint pump. Slip sleeve and
retaining ring over piston rod.
2. Push piston rod up into crosshead
assembly and align holes. Insert pin
through crosshead assembly and
piston. Slip sleeve up over pin and
insert retaining spring into groove
on crosshead assembly.
3. Secure paint pump to cover
assembly by two screws, up through
tube spacers and screw into cover
assembly.
4. Tighten screws evenly and
alternating to 20 ft. lbs.
5. Reassemble the Lower Check Valve
assembly by placing the Suction
Seat Assembly, O-ring, ball and
retainer in the suction nut and
screw nut onto pump body.
6. Reconnect sensor assembly to fluid
pump. Hold sensor with 7/8"
wrench while tightening swivel
connector.
7. Start the pump and operate slowly
to check the Piston Rod for binding.
Adjust screws holding pump
assembly to cover assembly if
necessary to eliminate binding.
8. Tighten the packing nut until
resistance is felt against the
belleville springs, then 1/2 turn
more CW (approximately three
threads showing). Fill the wet cup
of Packing Nut 1/3 full of Throat
Seal Oil (TSO).
9. Run unit at full pressure for several
minutes, release pressure and
repeat step 4. Readjust packing nut
according to paragraph above.
GEAR AND PUMP ASSEMBLY
Do not operate
machine without
cover guard in place.
1. Disconnect Fluid Pump as instructed
in Fluid Pump Disconnect.
2. Place piston in block (Tool Part No.
331-195) with the 3/8" dowel pin
(Tool Part No. 331-196) and hold in
vise. See diagram on page 21.
NOTE: DO NOT use smaller diameter pin
than Part No. 331-196 to hold piston.
3. Place a 1/4" allen wrench into
bottom of piston. Unscrew retainer
from piston. Clean all parts and
inspect them carefully for wear and
damage. Inspect the surface of
piston and seat for wear or
damage. Replace these parts if
needed. If repacking pump, replace
ball and O-ring with new parts
from Packing Kit.
4. Lay unit on its back and disassemble
gearbox.
5. Inspect bearings and Crosshead
Assembly Gearcrank and sleeve
bearing inside cover assembly for
wear or damage.
!
WARNING
AL2710