of 20
16
Pressure does
not build up when
pumping handle.
Insufficient fluid
level in reservoir.
Piston O-rings
worn or ruptured.
Bleed port check
valve or shut-
tle check valve
inoperative.
Fill tube assembly
and filter plugged.
Shuttle valve
pushed in for small
fluid displacement
when large fluid
displacement is
required.
Add fluid.
Inspect O-rings
and replace as
necessary. If
O-rings are new,
verify their fluid
compatibility.
Inspect O-rings
and replace as
necessary.
Remove and clean
fill tube assembly.
Refill reservoir
with clean fluid.
Pull shuttle valve
outward from
body.
High pressure
does not increase
when pumping
handle while
shuttle valve is
pushed in.
Air trapped in
pump piston.
Rapid pump han-
dle strokes which
lessen fluid flow
through the pump
piston.
Reprime pump.
Operate pump
handle with
smooth moderate
action.
Pump handle rises
after pumping.
High pressure
check valve O-ring
worn or ruptured.
Inspect O-ring
and replace as
necessary.
Piston plate (with
deadweights)
drops rapidly.*
Unable to hold
constant pressure.
Worn piston and
cylinder assembly.
Use a heavy
oil temporarily.
Replace piston &
cylinder.
Stacked dead-
weights wobble
when spinning
piston plate.*
Damaged dead-
weights.
Check dead-
weights for visible
damage (bends,
dents, nicks, etc.)
and alignment.
Piston plate as-
sembly will not
spin.*
Too heavy an oil
grade being used.
Flush & fill unit
with proper grade
of oil (SAE 20 or
SAE 10).
Replace piston &
cylinder assembly.
Disassemble and
flush complete
test unit with ker-
osene or alcohol.
Reassemble unit.
Pressure builds
up when pump-
ing handle, but
decreases when
pumping is
stopped.
Leakage at outlet
or gauge connec-
tions(s).
High pressure
check valve O-ring
worn or ruptured.
Defective pressure
release valve.
Inspect connec-
tions and tighten
as necessary.
Inspect O-ring and
replace as neces-
sary.
Hand tighten re-
lease valve.
Inspect release
valve seating sur-
faces. Replace as
necessary.
Remove release
valve seat and
inspect O-ring un-
derneath. Replace
as necessary.
5.4 Troubleshooting Chart
Corrective
Symptom Case
Action
Corrective
Symptom Case
Action
*These symptoms apply only to the 1305D Deadweight Testers.
