Malabar 795 - Troubleshooting Chart

PROBABLE CAUSE
Release valve open. (Oil
passing back into reservoir.)
Intake valve open. (Oil passing
back into reservoir.)
Discharge valve open. (Oil
passing back into pump
chamber.)
Sticking intake valve.
Clogged screen.
Lack of oil. Air under plunger.
Lack of oil.
Sticking intake valve.
High pressure leaks. (At pump
or release valve.)
Leaky release valve.
Leaky discharge valve.
Leaky release valve.
Defective "O" ring and back up
ring.
Damaged release valve.
Bent plunger.
Air under plunger.
Air in pump chamber.
Sticking intake valve.
Clogged screen.
Leaky intake valve.
Sticking intake valve.
Clogged screen.
TROUBLE
Jack will not raise.
Jack will not raise to full
height.
Jack will not raise capacity
load.
Jack raises and falls during
each stroke.
Jack will not hold up load.
Jack will not lower the load.
Jack will not close
completely.
Handle stroke only partly
effective.
Handle raises without effort.
Handle snaps back.
TROUBLE SHOOTING CHART
REMEDY
Close valve firmly.
Pump rapidly to flush dirt off.
Pump rapidly to flush dirt off.
Remove pump from jack base.
Unscrew valve block. Clean or
replace valve.
Remove and clean.
Refill. Check for leaks. Bleed
air out by opening release
valve. Pump rapidly a few
times and close release valve.
Refill, check for leaks.
Remove pump from jack base.
Unscrew valve block. Clean or
replace ball valves. Re-tighten
or repair.
Reseat valve.
Reseat valve and clean valve
block.
Tighten or replace ball valve or
packing.
Reseat valve.
Remove plunger and replace
"O" ring and back up ring.
Remove and replace parts as
needed.
Replace.
Bleed air out. Open release
valve and pump rapidly several
times. Close valve.
Open release valve and pump
rapidly several times. Close
valve.
Remove pump and clean valve
block.
Remove and clean.
Remove pump and clean valve
block.
Open release valve. Pump
rapidly several times. close
valve.
Remove and clean.
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