Tronair 02-7854C0110, Operation & Service Manual

Page: 6 / 47

Model: 02-7854C0110
12 & 25 Ton (10.87 & 22.68 Metric Ton) Axle Jack
03/2008 | Rev. 02 Page | 3
6.2
SERVICING JACK (continued)
To Bleed Jack for Air:
1. Open reservoir vent screw on hand pump.
2. Pump unit to fully extended position.
3. Turn jack upside down.
4. Push jack back to fully collapsed position.
6.3
JACK FUNCTION LOAD TEST
1. Take all necessary precautions to prevent injury.
2. Always jack against a load and never against the jack itself.
3. Apply a test load equal to the jack rated capacity plus 10%. Do not exceed this load.
4. Test annually.
7.0 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
8.0 PARTS LIST
Reference the following pages for Replacement Parts and Kits available.