Use of the product
36
Defaults
Possible causes
Remedies
Pump strokes quickly
downward (simple effect
working)
Bad feeding of the pump.
Check use parameters of the
accessories (pressure on follower
plate or suction rod,…). Accessories
can be not adapted or clogged.
Product is too viscous.
Bad definition of the pump.
Lower valve worn.
Check and replace parts.
A foreign product obstructs
the lower valve.
Clean and check.
Pump strokes quickly upward Valve worn or damaged.
Check and replace parts.
A foreign product obstructs
the upper valve.
Clean and check.
Pump cycles up and down
at different speeds
Valve, head piston seals or
cylinder worn.
Replace parts.
Seals incorrectly mounted or
damaged
Check the mounting; change if
necessary.
The pump does not deliver
enough pressure
Insufficient air pressure to the
motor (valve insufficiently
open, air leak,…)
Check, adjust.
Insufficient air inlet on the
motor or outlet clogged.(hose
not adapted)
Check filter, mounting, hose not
adapted.
Cup or head piston seals too
tightened.
Check mounting or loosen cup nut.
Abnormal operating after
racing or to elevated
temperature.
Head piston or cup seals too
tightened, damaged.
Check mounting, reduce pumping
rhythm. Replace parts if necessary.
Product drum empty.
Fill the drum, check the suction circuit
and possible air leakage.
Pressure drop when pump
strokes downward
Lower valve lifted or process Displace the pin.
Fluid leakage from the pump
body
Cylinder tightened
Check parts and change them if
necessary
No seals or seals damaged
