Technical data

YPE OF PROBLEM
10 OUTPUT
Continued)
WHAT TO CHECK
WHAT TO DO
If check is OK, go to next check1
When check is not OK refer to this column
4. Check to see if intake velve ball and piston
ball are seating properly. See manual
4. Remove intake valve and clean. Check balls
307-793.
and seats for nicks; replace if necessary. See
manual 307-783.
Aotor runs but pump does
ot stroke
5. Check for leaking around throat packing nut
which may indicate worn or damaged pack-
5. Replace packings. See manual 307-793. Also
check piston valve seat for hardened fluid or
ings. See manual 307-793.
nicks and replace if necessary.
1. Check displacement pump connecting rod
1. Replace pin if missing. Be sure retainer
pin. See page 28.
spring is fully in groove all around connect-
ing rod. See 28.
2. Check connecting rod assembly for damage.
See page 28.
2. Replace connecting rod assembly. See page
28.
iXCESSlVE PRESSURE
‘LUCTUATIONS
3. Be sure crank in drive housing rotates; plug
in sprayer and turn on momentarily to check.
3. Check drive housing assembly for damage
Turn off and unplug sprayer. See page 28
and replace if necessary. See page 28
ipray pattern variations.
1. Be sure both Gl and G2 leads from bridge
(308) to circuit board (23) are firmly
connected. See page 25.
1. Reconnect securely. See page 24 and 25.
2. Check stall pressure. Refer to Calibration
procedure on page 27.
2. Calibrate pressure control See page 27.
3. Check bourdon tube flag and detector posi-
tion. Turn pressure setting to maximum; flag
3. Carefully bend flag into alignment with
should not drag or bind in optical detector
detector slot to see if that corrects problem.
slot of circuit board.
If not, replace bare pressure control
assembly (361 I*. Calibrate pressure control
CIRCUIT BOARD
after reassembly.
OPTICAL
DETECTOR
FLAG
VIEW OF OPTICAL DETECTOR AND FLAG
4. Check circuit board (23) by substituting with
4. Replace circuit board. See page 25.
a good board. See page 25.
5. Check LOW OUTPUT section on page 16.
dOTOR IS HOT 6
WNS INTERMllTENTLY
1. Check to see if sprayer has been o
high pressure with small tips., whrc causes
3
erating at 1. Decrease pressure setting or increase tip
size.
low motor RPM and results tn excessive heat
build up.
2. Check to see if ambient temperature where
sprayer is located is more than 9ooF KKX)
or if sprayer is located in direct sun.
2. roo$biprayer to shaded, cooler area if
3. Check to see if sprayer has been left in a
stalled condition (sprayer turned on,
3. Turn off sprayer whenever you stop spraying
pressurized,. but not operating) for long
for a while and relieve fluid pressure.
periods of time.
‘When replacing the bare pressure control box (301), remove the circuit board, bridge,
circuit board, and electrical hardware and reinstall in the new bare box.
Troubleshooting continued on next pege.
820447 17