Servicing The Fluid Pump - Allpro 400E Operations Manual & Parts List

SERVICING THE FLUID PUMP

NOTE: Check everything in the Troubleshooting
Chart before disassembling the Fluid Pump.
SEE FIG 12, Page 19.
FLUID PUMP DISCONNECT
a. Flush out the material you are spraying, if
possible.
b. Follow the "Pressure Relief Procedure" on
page 6.
c. 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 connec-
tor with an 11/16" wrench.
d. Move the piston rod to its lowest stroke
position by rotating the motor fan or by cycling
rod to lowest position.
e. Unscrew the two screws (14) from cover
assembly.
f. Slide retaining ring (12) down off crosshead
assembly (3). Push Pin (10) out of crosshead
allowing removal of fluid pump from unit.
FLUID PUMP REINSTALL:
a. Loosen packing nut and extend piston rod to
its upper position in paint pump. Slip sleeve and
retaining ring over piston rod.
b. Push piston rod up into crosshead assembly
and align holes. Insert pin through crosshead
assembly and piston. Insert retaining spring into
groove on crosshead assembly.
c. Secure paint pump to cover assembly by two
screws, up through tube spacers and screw into
cover assembly.
d. Tighten screws evenly and alternating to 20 ft.
lbs.
18
e. Reassemble the Lower Check Valve assem-
bly by placing the Suction Seat Assembly, 0-ring,
ball and retainer in the suction nut and screw nut
onto pump body.
f. Reconnect sensor assembly to fluid pump.
Hold sensor with 7/8" wrench while tightening
swivel connector.
g. Start the pump and operate slowly to check
the Piston Rod for binding. Adjust screws hold-
ing pump assembly to cover assembly if neces-
sary to eliminate binding.
h. 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).
i. Run unit at full pressure, release pressure &
repeat step h.
GEARBOX SLEEVE
BEARING REPLACEMENT
FIGURE 11
1
2
3
Note: When replacing item (1),
cover the outside of sleeve with clear sili-
cone prior to inserting into cover assembly.
FIGURE 11 PARTS LIST
ITEM NO. PART NO.
1 331-061
2 331-103
3 331-197
DESCRIPTION
Sleeve Bearing
Washers (2)
Screws (2)