Graco T-Max 405 248195, Repair Manual

Page: 9 / 32

9 309977
Troubleshooting
LOW OR FLUCTUATING OUTPUT
TYPE OF PROBLEM WHAT TO CHECK
If check is OK, go to next check
WHAT TO DO
When check is not OK refer to this column
Motor runs and pump strokes 1. Material supply. 1. Refill hopper and reprime pump.
2. Loose fittings. 2. Tighten; use thread sealant or sealing tape
on threads if necessary.
3. Intake valve ball and piston ball are seating
properly. See page 18.
3. Remove intake and piston valves and
clean. Check balls and seats for nicks or
obstructions; replace if necessary, page
18. Clean hopper before using to remove
particles that could clog pump.
4. Leaking around throat packing nut which may
indicate worn or damaged packings. See
page 18.
4. Replace packing, page 18. Also check pis-
ton valve seat for hardened paint or nicks
and replace if necessary. Tighten packing
nut.
5. Pump rod damage. 5. Repair pump, page 18.
6. Capacitor failure. Visually inspect capacitor
near terminals. Ensure that orange safety re-
lief plug is intact.
6. Replace capacitor.
Motor runs but pump does not
stroke
1. Displacement pump pin (75) (damaged or
missing), page 18.
1. Replace pump pin if missing. Be sure re-
tainer spring (76) is fully in groove all
around connecting rod, page 18.
2. Connecting rod assembly (45) for damage,
page 21.
2. Replace connecting rod assembly,
page 21.
3. Gears or drive housing, page 22. 3. Inspect drive housing assembly and gears
for damage and replace if necessary,
page 22.