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Pump operates but Part B output
pressure drops during upstroke.*
Pump operates but part B output pres-
sure drops during downstroke.*
Pump operates but part B output pres-
sure drops during both strokes.*
Fluid leaks around fluid pump packing
nut.
Relief valve opens too soon or won't
close.
* Fluid ratio will be wrong.
** Purge all air out of the system before proportioning the fluids.
Troubleshooting Chart
Dirty, worn or damaged part B pump
piston valve.
Worn or damaged part B pump piston
packings.
Dirty, worn or damaged part B pump
intake valve.
Fluid not filling cylinder on upstroke,
"diving" on top of change–over.
Dirty, worn or damaged part B pump
intake valve.
Fluid supply low.**
Loose packing nut or worn throat
packings.
Relief valve is damaged.
Clean, service – see instruction
manual 307944.
Replace.
Clean, service – see instruction
manual 307944.
Increase pressure on feed
pump. Check inlet filter screen.
Check foot valve.
Clean, service – see instruction
manual 307944.
Refill or change container.
Tighten, replace.
Service – see instruction manual
308547.
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