Graco Python XL 5/8" [17/48] Follow pressure relief procedure page 12 before checking or repairing pump

Graco Python XL 5/8
Troubleshooting
3A3948B 17
Troubleshooting
1. Follow Pressure Relief Procedure, page 12,
before checking or repairing pump.
2. Check all possible problems and causes before dis-
assembling pump.
Problem Cause Solution
Air bubbles in fluid Fluid inlet line is loose Tighten
Fluid leaking Loose fittings Tighten fittings
Worn seals Adjust packing (if leak persists,
replace packing)
Pump stroking, but no fluid moving Air in pump Prime pump
Worn or damaged check valve seals Rebuild inlet and outlet check valves
Pneumatic motor will not run. Damaged pneumatic valve (214). Replace or service pneumatic valve
(214). See page 25.
Damaged pilot valve (213). Replace pilot valves (213). See page 27.
Air continuously exhausting around
pneumatic motor piston rod.
Damaged u-cups (207). Replace piston rod u-cups (207). See
page 29.
Air continuously exhausting from muf-
fler.
Damaged pneumatic valve plate (305)
or cup (312).
Replace or service pneumatic valve
(214). See page 25.
Pneumatic motor “bounces” at top of
stroke.
Damaged bottom pilot valve (213). Replace bottom pilot valve (213). See
page 27.
Pneumatic motor “bounces” at bottom of
stroke.
Damaged top pilot valve (213). Replace top pilot valve (213). See page
27.
Icing inside motor. Pneumatic motor operating at high pres-
sure or high cycle rate.
Reduce pressure, cycle rate, or duty
cycle of motor.
Reduce dew point of compressed air in
moisture coalescing filter.
Pump fails to operate. Restricted line or inadequate air/gas sup-
ply; closed or clogged valves.
Clear line or increase air/gas supply.
Check that the valves are open.
Obstructed fluid line; fluid line ID is too
small.
Open, clear*; use line with larger ID.
Pump operates but does not prime. Held open or worn check valves or pack-
ings.
Clear valve; replace packings. See page
20.
Pump operates, but output is low on both
strokes.
Restricted line or inadequate air/gas sup-
ply; closed or clogged valves.
Clear line or increase air/gas supply.
Check that the valves are open.
Obstructed fluid line; fluid line ID is too
small.
Open, clear*; use line with larger ID.
Worn packings in pump. Replace packings. See page 20.
Pump operates, but output is low on
downstroke.
Held open or worn check valves or pack-
ings.
Clear valve; replace packings. See page
20.

Содержание

Скачать