Spec Sheet

Ref 300882 Rev. F
09-18
PROBLEMS PROBABLE CAUSES SOLUTIONS
Frequent valve recycles Damaged check valve O-ring
Leaking connections
Restricted bypass or too small diameter of
the bypass hose
Replace
Check or renew
Clean or adapt passage diameter
Valve does not reach
pressure
Piston O-rings worn out
Debris between seat and shutter
Seat worn out
Nozzle worn out
Incorrect choice of nozzle
Replace
Clean the seat
Replace
Replace
Fit with smaller nozzle
High pressure peaks at
gun closure
There is not a minimum of 5% of total flow
discharged in bypass
Excessive flow in bypass
Adjustment with spring totally compressed
Reset Correctly
Change type of valve or adjust passages
Loosen adjustment screw and eventually
fit with smaller nozzle
Valve does not discharge
at low pressure at gun
closure
Jammed check valve
Debris on check valve
Clean or replace
Clean
TROUBLESHOOTING
GENERAL PUMP 1174 Northland Drive • Mendota Heights, MN 55120
Phone: [phone] • Fax: [phone] • e-mail: [e-mail] • www.generalpump.com
PULSAR4KLP/PULSAR4KHP
GENERAL PUMP A member of the Interpump Group
Trapped Pressure Unloader Valve
MAINTENANCE
STANDARD: every 400 working hours, check and lubricate the seals with water resistant grease.
SPECIAL: every 800 working hours, check the wear of the seals and internal parts and, if necessary, replace with
original GP parts taking care, during installation, to lubricate with water resistant grease.
The manufacturer is not to be considered responsible for damage as a result from incorrect fitting and
maintenance.