UNDERCARRIAGE TMS700E SERVICE MANUAL
8-72 Published 01-29-2015, Control # 512-01
Functional Check
1. Activate the hydraulic system.
2. Extend and retract the jack cylinder.
3. Check for smooth operation of the cylinder.
4. Check all hydraulic connections and hoses for evidence
of leakage.
Outrigger Jack Cylinder Internal Leak Test
Use the following procedure to troubleshoot and diagnose an
internal leak, a leaking pilot operated check valve or a
thermal contraction on an outrigger jack cylinder.
Checking Cylinder for Internal Piston Seal Leak
1. Fully extend and set the outriggers.
2. Remove the rod side cylinder hose from the suspected
leaking jack cylinder (see Figure 8-70). Oil will flow until
the cavity in the cylinder port block empties. Once the
port block cavity empties, oil should stop flowing from
the rod side port.
Check for the following conditions:
a. If oil stops flowing
, the cylinder’s internal piston seal
is sealing properly.
b. If oil continues to flow
out the rod port, the cylinder’s
internal piston seal is leaking.
3. After determining the condition of the cylinders internal
piston seal, leave the rod side hose disconnected and
continue to test the pilot operated check valve.
WARNING
Perform the following procedures with the crane
positioned on a firm level surface with outriggers fully
extended and set, and the crane in the travel position
Remove hoses from one cylinder at a time.
NOTE: Keep hydraulic fittings and hoses close to
angles shown for proper tracking during
extension and retraction.
15°
15°
Extend Port
Retract Port
FIGURE 8-69
CAUTION
When performing step number 2, remove hose to adapter
connection slowly. Trapped pressure may exit between
the outrigger cylinder and the work port pilot operated
check valves in the outrigger selector valve.
FIGURE 8-70
Piston Port
Rod Port
6432
Reference Only
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