Troubleshooting; Daily Maintenance - Graco 26D001 Operation And Parts

Troubleshooting

Problem
The pump fails to operate
The pump operates, but the output is
low on both strokes
The pump operates, but the output is
low on the downstroke
The pump operates, but the output is
low on the upstroke
Erratic or accelerated operation
Pump slowly moves after fluid shutoff in
the downstroke
Pump moves slowly after fluid shutoff in
the upstroke
Air continuously escapes around piston
rod
Air continuously escapes from muffler
Air motor "bounces" at top of stroke
Air motor "bounces" at bottom of stroke Damaged top valve
Icing inside motor

Daily Maintenance

Check the clamp nut (DN) on a daily basis and tighten if
necessary.
3A8502A
1. Follow Pressure Relief Procedure, page 14,
2. Check all possible problems and causes before
Cause
Damaged air valve
Damaged pilot valve
Inadequate air supply or restricted
lines.
Closed or clogged air valves
Clogged fluid hose or valve
Clogged fluid hose or valve
Exhausted fluid supply
Worn or damaged valves or seals
Held open or worn intake valve
Worn or damaged valves or seals
Held open or worn piston valve
Worn or damaged valves or seals
Exhausted fluid supply
Clogged or dirty intake valve check ball Clean ball and seat.
Worn or damaged valves or seats
Clogged or dirty piston ball or seat
Worn or damaged valves or seats
Damaged U-cups (307)
Damaged air valve plate (413) or cup
(414)
Damaged bottom valve
Air motor operating at high pressure or
high cycle rate
before checking or repairing pump.
disassembling pump.
Replace or service air valve (314).
Replace pilot valves (313).
Clean lines or increase the air supply.
See Technical Specifications, page
30.
Open or clear the valves.
Clear the hose or valve.
Clear the hose or valves.
Refill the fluid supply and reprime the
pump.
Service the valves or seals.
Clear or service the valve.
Service the valves or seals.
Clear or service the valve.
Service the valves or seals.
Refill the fluid supply and reprime the
pump.
Install repair kit.
Clean ball and seat.
Install repair kit.
Replace piston rod U-cup (307).
Replace or service air valve (314).
Replace bottom pilot valve (313).
Replace top pilot valve (313).
Reduce pressure, cycle rate, or duty
cycle of motor. Reduce dew point of
compressed air in moisture-coalescing
filter.
Troubleshooting
Solution
17