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Troubleshooting
16 312376L
Troubleshooting
1. Follow Pressure Relief Procedure, page 12. 2. Check all possible problems and causes before dis-
assembling pump.
Problem Cause Solution
Pump fails to operate. Restricted line or inadequate air sup-
ply; closed or clogged valves.
Clear; increase air supply. Ensure that all
valves are open.
Obstructed fluid hose or gun/valve; fluid
hose ID is too small.
Open, clear*; use a hose with a larger ID.
Fluid dried on displacement rod. Clean. Always stop pump at bottom of
stroke. Keep enclosed wet cup 1/3 filled
with a compatible solvent.
Dirty, worn, or damaged motor parts. Clean or repair; see separate motor man-
ual.
Runaway occurred. See runaway section of Supply Units Oper-
ation manual 313526.
Pump operates but output is
low on both strokes.
Restricted line or inadequate air sup-
ply; closed or clogged valves.
Clear; increase air supply.
Ensure all valves are open.
Increase air pressure to ram for better load-
ing.
Obstructed fluid hose or gun/valve; fluid
hose ID is too small.
Open, clear*; use a hose with a larger ID.
Bleed-type air valve is partially open. Close bleed-type air valve.
Air is leaking into supply container. Check ram plate seal.
Fluid is too heavy for pump priming. Use drain/purge valve. Use a ram. See
Supply Units Operation manual 313526.
Held open or worn intake valve or
seals.
Clear valve; replace seals. See separate
Check-Mate Displacement Pump manual
312375.
Worn packings in displacement pump. Replace packings. See separate
Check-Mate Displacement Pump manual
312375.
Pump operates, but output is
low on downstroke.
Fluid is too heavy for pump priming. Use drain/purge valve. Use a ram. See
Supply Units Operation manual 313526.
Held open or worn intake valve or
seals.
Clear valve. Replace seals. See separate
Check-Mate Displacement Pump manual
312375.
Pump operates, but output is
low on upstroke.
Held open or worn intake valve or
seals.
Clear valve. Replace seals. See separate
Check-Mate Displacement Pump manual
312375.