7
824113
Intermediate Problem Solving
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
(continued)
3. Release gun trigger. Observe resting position of
pump rod (107).
3. If pump consistently comes to rest with
rod (107) fully extended, the piston pack-
ings and/or piston valve may be worn.
Service the pump. See page 12.
4. Electrical supply. Meter must read: 105–125
VAC for models 820169 and 824175.
4. Reset building circuit breaker; replace
building fuse. Repair electrical outlet or
try another outlet.
5. Extension cord size and length; must be at
least 12 gauge wire and less than 150 ft
(45 m) long.
5. Replace with a correct, grounded exten-
sion cord.
6. Motor brushes. See Electrical – What To
Check, item 4, on page 5.
6. See page 10.
7. Motor start board (47) by substituting with a
good board.
CAUTION: Do not perform this check until mo-
tor armature is determined to be good. A bad
motor armature can burn out a good board.
7. Replace board. See page 14.
8. Motor armature for shorts by using an armature
tester (growler) or perform motor test. See page
9.
8. Replace motor. See page 13.
Drain valve leaks
1. Drain valve for correct torque and/or worn
parts. Check for debris trapped on seat.
9. Tighten to 185 in–lb (21 N.m). Clean
valve and replace with new gasket (42a)
and sealant (42d). See page 18.
Transducer leaks
1. Slight leakage from transducer is normal.
1. Periodically remove residue from its cyl-
inder port. See page 17.
No output: motor runs and
pump strokes
1. Paint supply.
1. Refill and reprime pump.
2. For clogged intake strainer.
2. Remove and clean, then reinstall.
3. For loose suction tube or fittings. See
page 17.
3. Tighten; use thread sealant on npt
threads of adapter (38).
4. To see if intake valve ball and piston ball are
seating properly. See page 12.
4. Remove intake valve and clean. Check
ball and seat for nicks; replace as need-
ed. See page 12. Strain paint before us-
ing to remove particles that could clog
pump.
5. For leaking around throat packing nut which
may indicate worn or damaged packings. See
page 12.
5. Replace packings. See page 12. Also
check piston valve seat for hardened
paint or nicks and replace if necessary.
Tighten packing nut/wet-cup.
6. Release gun trigger. Observe resting position of
pump rod (107).
6. If pump consistently comes to rest with
rod (107) fully extended, the piston pack-
ings and/or piston valve may be worn.
Service the pump. See page 12.
No output: motor runs but
pump does not stroke
1. Displacement pump connecting rod pin (17).
See Fig. 9, page 12.
1. Replace pin if missing. Be sure retainer
spring (18) is fully in groove all around
connecting rod.
7. Connecting rod assembly (15) for damage.
See page 15.
7. Replace connecting rod assembly. See
page 15.
8. Be sure crank in drive housing rotates; plug in
sprayer and turn on briefly to check. Turn off
and unplug sprayer. See page 15.
8. Check drive housing assembly for
damage and replace if necessary. See
page 15.
