![background image](http://html1.mh-extra.com/html/graco/supercat-232721/supercat-232721_instructions-parts-list-manual_2251605071.webp)
308925
71
Troubleshooting
Pump Lowers
WARNING
INJECTION HAZARD
To reduce the risk of a serious injury,
follow the
Pressure Relief Procedure
on page 21 before checking or servicing
the equipment.
1.
Follow the
Pressure Relief Procedure
on page
21.
2.
Check all possible causes and problems before
disassembling the pump.
Pump runs too fast, or erratically
Check if the piston valve is stuck open, or if the
piston packings are worn. Clear the piston valve;
replace the packings. See your separate pump
manual (supplied).
Check if the intake valve is stuck open, or if the ball
or seat is damaged. Clear or service the intake
valve. See your separate pump manual.
Output pressure of proportioning pump A
or B is low on the upstroke
Check if the piston valve is stuck open, or if the
piston packings are worn. Clear the piston valve;
replace the packings. See your separate pump
manual.
Output pressure of proportioning pump A
or B is low on the downstroke
Check if the intake valve is stuck open, or if the ball
or seat is damaged. Clear or service the intake
valve. See your separate pump manual.
Output pressure of proportioning pump A
or B is low on both strokes
Clean or repair the fluid filters; see the separate
filter manual 307273 (supplied).
Check if the intake valve is stuck open, or if the ball
or seat is damaged. Clear or service the intake
valve. See your separate pump manual.
Check if the piston valve is stuck open, or if the
piston packings are worn. Clear the piston valve;
replace the packings. See your separate pump
manual.
Summary of Contents for SuperCat 232721
Page 23: ...308925 23 Notes...
Page 111: ...308925 111 Notes...
Page 112: ...308925 112 Dimensions 8787A 42 in 1067 mm 66 in 1676 mm 74 in 1880 mm...