Troubleshooting
3A8564C
11
Troubleshooting
1. Follow
2. Check all possible problems and causes before
disassembling pump.
Problem
Cause
Solution
Pump fails to operate.
Restricted line or inadequate air
supply; 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 grease
cup filled with a compatible grease.
Dirty, worn, or damaged motor
parts.
Clean or repair; see separate motor
manual.
Runaway occurred.
See runaway section of Supply
Units Operation manual 313526.
Pump operates but output is low on
both strokes.
Restricted line or inadequate air
supply; closed or clogged valves.
Clear; increase air supply.
Ensure all valves are open.
Increase air pressure to ram for bet
-
ter loading.
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.
Worn packings in displacement
pump.
Replace packings.
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.
Pump operates, but output is low on
upstroke.
Held open or worn intake valve or
seals.
Clear valve. Replace seals.
