Troubleshooting - Graco Python XL-DA25 Series Instructions And Parts

Troubleshooting

Troubleshooting
Problem
Air bubbles in fluid.
Fluid leaking.
Pump stroking, but no fluid moving.
Pneumatic motor will not run.
Air continuously exhausting around
pneumatic motor plunger.
Air continuously exhausting from muffler. Damaged pneumatic valve plate (305) or
Pneumatic motor "bounces" at top of
stroke.
Pneumatic motor "bounces" at bottom of
stroke.
Icing inside motor.
Pump fails to operate.
Pump operates but does not prime.
Pump operates, but output is low on both
strokes.
Pump operates, but output is low on
downstroke.
Erratic or accelerated pump speed.
Fluid being pumped is visible on the pack-
ing nut.
14
1. Follow Pressure Relief Procedure, page 11,
2. Check all possible problems and causes before dis-
Cause
Fluid inlet line is loose.
Loose fittings.
Worn seals.
Air in pump.
Worn or damaged check valve seals.
Damaged pneumatic valve (217).
Damaged pilot valve (219).
Damaged u-cups (203).
cup (312).
Damaged bottom pilot valve (219).
Damaged top pilot valve (219).
Pneumatic motor operating at high
pressure or high cycle rate.
Restricted line or inadequate air/gas
supply; closed or clogged valves.
Obstructed fluid line; fluid line ID is too
small.
Held open or worn check valves or
packings.
Restricted line or inadequate air/gas
supply; closed or clogged valves.
Obstructed fluid line; fluid line ID is too
small.
Worn packings in pump.
Held open or worn check valves or
packings.
Exhausted fluid supply.
Held open or worn check valves or
packings.
Worn packings.
before checking or repairing pump.
assembling pump.
Tighten.
Tighten fittings.
Adjust packing (if leak persists, replace
packing).
Prime pump.
Rebuild top and bottom poppets.
Replace or service pneumatic valve (217).
See page 19.
Replace pilot valves (219).
See page 22.
Replace plunger u-cups (203).
See page 25.
Replace or service pneumatic valve (217).
See page 19.
Replace bottom pilot valve (219). See
page 22.
Replace top pilot valve (219).
See page 22.
Reduce pressure, cycle rate, or duty cycle
of motor.
Reduce dew point of compressed air in
moisture coalescing filter.
Clear line or increase air/gas supply.
Check that the valves are open.
Open, clear*; use line with larger ID.
Clear valve; replace packings.
See page 16.
Clear line or increase air/gas supply.
Check that the valves are open.
Open, clear*; use line with larger ID.
Replace packings. See page 16.
Clear valve; replace packings.
See page 16.
Refill and prime.
Clear valve, replace packings.
See page 16.
Tighten packing nut.
Replace packings. See page 16.
Solution
3A6831A