Tronair 02-7833C0110, Operation & Service Manual

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Models: 02-7833C0110, 02-7846C0110, 02-7852C0100,02-7861C0100, 02-7861-9100,
02-7863C0100, 02-7902C0100, 02-7918C0100, 02-7918C9100
12 Ton (10.8 Metric Ton) Axle Jack
05/2021 | Rev. 03 Page | 5
6.0 TROUBLE SHOOTING
TROUBLE PROBABLE CAUSE ACTION
Fluid leakage at pump
piston or pump body Damaged backup ring, o-ring, piston or
pump body
Remove piston and pump body. Inspect for
damage. Replace defective part(s). Replace
removed o-ring and backup ring
External fluid leakage at
ram(s) Damaged o-ring, backup ring or inner
cylinder wall
Remove ram(s) as a unit from cylinder.
Inspect parts. Replace o-ring and defective
part(s)
Jack fails to lift rated load
Release valve not closed properly Fully tighten release valve
Low fluid level Fill to correct fluid level
Pressure relief valve improperly adjusted Adjust or replace release valve
Leakage at inlet or outlet check ball
Inspect valve body for wear or replace valve
body and check balls
Vent screw closed Open vent screw
Ram(s) will not support
load after manual or
pneumatic pump up
Leaking ram o-ring seals
Check for external leakage, if present replace
defective seal and back up ring
Leaking pressure check valve
Inspect valve body for wear or replace valve
body and check balls
Leaking pressure relief valve
Remove release valve, inspect ball and ball
seat in pump block. Replace effective part(s)
Ram(s) raise and fall with
each manual pump stroke
Release valve open Fully tighten release valve
Inlet check valve not seated or sticking
Pump rapidly to dislodge or replace valve
body
Pressure check valve not seated or sticking
Pump rapidly to dislodge or replace valve
body
Jack fails to lower
Ram locknut not loosened Raise jack ¼ inch and release locknut
Vent screw closed Open vent screw
O-Ring (pinched or rolled)
Replace o-ring and back-up ring, clean up
cylinder wall of debris