Troubleshooting - Graco Monark Instruction Manual

WARNING
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
Problem
Pump fails to operate.
Pump operates but output is low on
both strokes.
Pump operates but output is low on
downstroke.
Pump operates but output is low on
upstroke.
Erratic or accelerated operation.
* To determine if the fluid hose or gun is obstructed, follow the Pressure Relief Procedure on page 8. Discon-
nect the fluid hose and place a container at the pump fluid outlet to catch any fluid. Turn on the air just enough to
start the pump (about 20–40 psi [1.4–2.8 bar]). If the pump starts when the air is turned on, the obstruction is in
the fluid hose or gun.
12 307985

Troubleshooting

1. Relieve the pressure.
2. Check all possible problems and solutions before
Cause
Restricted line or inadequate air
supply.
Dirty or damaged air motor.
Clogged fluid hose, gun, or nozzle.
Restricted line or inadequate air
supply.
Exhausted fluid supply.
Clogged fluid hose, gun, or nozzle.
Loose packing nut or worn throat
packings.
Piston and intake valves need ad-
justment.
Held open or worn intake valve.
Held open or worn fluid piston valve
or packings.
Exhausted fluid supply.
Piston and intake valves need ad-
justment.
Held open or worn intake valve.
Held open or worn fluid piston valve
or packings.
disassembling pump.
Clear; increase air supply.
Service air motor (see 307043).
Clear.*
Clear; increase air supply.
Refill; reprime or flush.
Clear.*
Tighten packing nut (see page 8);
replace throat packings.
Adjust; see manual 307983.
Clear; service. See manual 307983.
Clear; service. See manual 307983.
Refill; reprime or flush.
Adjust; see manual 307983.
Clear; service. See manual 307983.
Clear; service. See manual 307983.
Solution