Graco T-Max 405 248195, Repair Manual

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8 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
Low Output 1. For worn spray tip. 1. Follow Pressure Relief Procedure Warn-
ing, then replace tip. See your separate
gun or tip manual.
2. Verify pump does not continue to stroke when
gun trigger is released.
2. Service pump. Check piston and intake
valves for wear or obstructions.
See page 18.
3. Filter clogged (If optional filter is installed). 3. Relieve pressure. Check and clean filter.
4. Material hose length. Longer hose length re-
duces sprayer performance.
4. Replace with hose length less than speci-
fied maximum.
5. Pump hopper adapter connections. 5. Tighten any loose connections. Replace
pump hopper adapter if cracked or punc-
tured.
6. Electrical supply with volt meter.
Meter must read:
210–255 Vac for 220–240 Vac models;
85–130 Vac for 100–120 Vac models.
Low voltages reduce sprayer performance.
6. Reset building circuit breaker; replace
building fuse. Repair electrical outlet or try
another outlet.
7. Extension cord size and length; must be at least
1.0 mm
2
(12 awg) wire and no longer than 90 m
(295 ft). Longer cord lengths reduce sprayer
performance.
7. Replace with a correct, grounded exten-
sion cord.
8. Leads from motor to pressure control circuit
board (38) for damaged or loose wires or con-
nectors. Inspect wiring insulation and terminals
for signs of overheating.
8. Be sure male terminal blades are centered
and firmly connected to female terminals.
Replace any loose terminal or damaged
wiring. Securely reconnect terminals.
9. For loose motor brush leads and terminals. See
page 11.
9. Tighten terminal screws. Replace brushes
if leads are damaged. See page 11.
10.For worn motor brushes which must be 1/4 in.
minimum. See page 11.
10. Replace brushes. See page 11.
11. For broken and misaligned motor brush
springs. Spring must rest squarely on top of
brush.
11. Replace brush if spring is broken. See
page 11.
12.Motor brushes for binding in brush holders.
See page 11.
12.Clean brush holders, remove carbon dust
with small cleaning brush. Align brush lead
with slot in brush holder to assure free verti-
cal brush movement.
13.Low stall pressure. 13. Do either or both:
a. Turn pressure control knob fully
clockwise. Make sure pressure
control knob is properly installed to
allow full clockwise position.
b. Try a new transducer.
14.Motor armature for shorts by using an armature
tester (growler) or perform spin test.
See page 11.
14.Replace motor. See page 13.