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Intermediate Problem
Solving
YPE
OF
PROBLEM
ow output (continued)
Vain valve leaks
iansducer leaks
lo
output: motor runs anc
lump strokes
Jo
output: motor runs bui
u m p does not stroke
WHATTO CHECK
WHAT TO DO
If check
is OK.
GO
to next check
When check is not OK. refer to this column
3.
Release gun trigger. Observe resting position of
3 . If
pump consistently comes to rest with
pump rod (107).
I
ings andlor piston valve may be worn.
rod (107) fully extended, the piston pack
Service the pump. See page
22,
4.
Check electrical supply with volt meter. Meter 4. Reset building circuit breaker; replace
should read VAC.
I
building fuse. Repair electrical outlet or
I
try anoiher outlet.
6. Check motor brushes. See Electrical
-
What To 6. See page 21.
7. Check motor start board (47) by substituting 7. Replace board. See page
27.
Check, item 4, on page 15.
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.
8. Check motor armature for shorts by
using an
8. Replace motor. See page 26.
armature tester (growler) or perform motor test.
See page 19.
worn parts. Check for debris trapped on seat. valve
and replace with new gasket (42a)
1. Check drain valve for correct torque andlor 9. Tighten
to 185 in-lb (21 Nm). Clean
and sealant (42d). See page 32.
1.
Slight leakage from transducer is normal.
1. Periodically remove residue from its cylin.
1.
Check paint supply.
1,
Refill and reprime pump.
der port. See page 30.
2. Check for clogged intake strainer,
3.
Check for loose suction tube or fittings.
See
page 31.
4. Check to see if intake valve ball and piston bail
are seating properly. See page 22.
5. Check for leaking around throat packing
nut
which may indicate worn or damaged packings.
See page 22.
6. Release gun trigger. Observe resting position 01
pump rod (107).
1. Check displacement pump connecting rod pin
(17). See Fig. 17, page
22.
2. Remove and clean, then reinstall.
3.
Tighten: use thread sealant on npt
threads
of
inlet tube
(38).
Check for dam.
aged O-ring (27).
ball and seat for nicks; replace as need-
ed. See page 22. Strain paint before
us-
ing
to
remove particles that could clog
Pump.
5. Replace packings. See page 22. Also
check piston valve seat for hardened
paint or nicks and replace
if
necessary.
Tighten Dackincl nWwet-cup.
4. Remove intake valve and clean. Check
6. If pump consistently comes to rest with
rod (107) fully extended. the piston pack.
ings andlor piston valve may be worn.
Service the pump. See page 22.
-~
~
~
~
I.
Replace pin if missing. Be sure retainer
spring (18)
is
fully
in
groove all around
connecting rod.
7. Check connecting rod assembly (15) for dam- connecting
rod assembly. See
age. See page
28.
.
I
8.
Be sure crank in drive housing rotates; plug in
8. Check drive housing assembly for
. .
soraver and turn on brieflv to check. Turn
off
damaqe and reolace if necessaty. See
and unplug sprayer. See page
28.
I
page28.
308-216
17
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