© Titan Tool Inc. All rights reserved. 25
Pump Section Repair and Service
WARNING: Before proceeding, follow the Pressure Relief
Procedure outlined on Page 5. Additionally, follow all other
warnings to reduce the risk of an injection injury, injury
from moving parts or electric shock.
1. Remove Safety Plate #43 (on pg. 20).
2. Stop the sprayer at the top of its stroke so that the piston is
in its highest position. Turn off and/or unplug the sprayer.
3. Remove the return tube #1 with a wrench.
4. Squeeze retaining clip #3 together and pull it down and out
of foot valve #323.
5. Remove siphon assembly #7 by pulling it down and out of
foot valve #323.
4. Tilt pump back for easy access to pump section.
Seat Service and Repair
The design of the Fluid Section allows access to the inlet and
outlet valves and seat without completely disassembling the
Fluid Section. It is possible that the valves may not seat
properly because of debris stuck in the inlet or outlet seat.
Follow the instructions below for access to those areas.
5. Place a wrench on the Foot Valve #323 and unthread.
6. Clean out all debris. Examine Valve and Seat. If damaged
replace. Continue if necessary or re-install.
7. Place a 3/4" socket on the Outlet Valve Housing and Seat
#312 and remove.
8. Clean out all debris. Examine Valve and Seat. If damaged,
reverse or replace.
9. Reassemble and test unit. Should unit not perform
properly, consult the Troubleshooting Guides in this manual
or continue with the Repair and Packing Replacement
instructions below.
Service/Replacement of Upper (Outlet) Valve
10. To clean or replace upper valve, remove Valve Housing
#312 while piston assembly #315 is still attached to pump.
This will prevent the piston from rotating.
11. Remove upper valve cage #310 and Outlet Valve Seat #313
& Ball #311 Clean and inspect along with housing #312.
Replace if worn or damaged. Use fine sandpaper to
remove dried paint.
12. Reattach assemblies #309–312 to piston #308, and secure
tightly with a wrench.
Packing Replacement
13. Unscrew hose #19 from fitting #392.
14. Remove screws #306 with a 3/8" hex wrench and slide
pump section down so that the piston is clear to slide off.
15. Inspect polyethylene seal #391 on fitting after removing
pump section. Clean or Replace.
16. Remove Retainer #301 and slide piston down through pump
housing #305 by lightly tapping on top of piston assembly
#315. Clean and inspect piston for wear. Replace if
necessary.
17. Remove packings #304 and #307 from pump housing #305
and replace with a new set. Always insert packings with the
raised side facing into pump mount assembly.
18. Reattach Retainer #301 and make sure that the upper guide
#302 is cleaned and undamaged.
19. Insert pump housing items #301–#307 into a vise, leaving
enough room to slide piston through bottom of pump
housing #305.
20. Using the piston guide tool (included in repacking kit), which
slides over the top of the piston assembly #315, insert the
piston through bottom of pump housing #305 and tap lightly
with a rubber mallet on bottom of piston until inserted.
21. Align flats on piston so that it is perpendicular to housing
#305 and will line up when reattaching to connecting rod.
This can be achieved by rotating the piston by placing a
wrench on the valve housing assembly #312 and turning.
CAUTION: Never use a wrench on the piston itself. This
could cause damage to the piston and cause
leakage.
22. Slide assembled pump housing with piston assembly onto
connecting rod and secure with screws #306. Be certain
that outlet hole is facing towards pump motor.
23. Reattach hose #19 to fitting #392 Be sure that polyethylene
gasket #391 is in place.
24. Reattach lower foot valve assembly #325
26. Reattach return tube #1 and siphon assembly #7.
NOTE: Repacking Kit P/N 730-401 is available. For
best results use all parts supplied in this kit.
NOTE: Packing does not need to be adjusted.
Fluid Section Assembly and Siphon Assembly Procedures
