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Section III. INSPECTION AND SERVICING
Up
TM-55-1730-208-13 Jack Hydraulic Part Number 50J25178 (TYPE B6) Manual
Next
Table 3-2. Organizational Troubleshooting Data (Cont)
TM 55-1730-208-13
Section V. OPERATIONAL CHECKOUT
operating procedure to insure trouble is not due to
3-15. General.
incorrect operation.
This  section  provides  information  useful  in
3-16. Performance Checks.
diagnosing and correcting unsatisfactory operation or
(Not applicable.)
failure of the hydraulic jack.  Each trouble symptom
stated is followed by a list of probable causes.  The
possible remedy recommended is described opposite
3-17. Troubleshooting Data.
the probable cause. Any operational  trouble  beyond
Refer
for
organizational
the  scope  of organizational maintenance must be
troubleshooting data applicable to the hydraulic jack.
reported to the next higher maintenance level as
applicable. Before looking for a trouble, check the
Table 3-2. Organizational Troubleshooting Data
Malfunction
Probable Cause
Jack will not rise capacity load
Faulty safety relief valve
Replace safety relief valve.
High pressure leak at hose or
Tighten or replace hose or plug.
plug
Leaking discharge valve
Replace valve body.
Leaking release assembly
Tighten release assembly.
Defective ram packing
Replace ram packing.
Defective pump body packing
Replace pump body packing.
Jack will not support load.
Leaking safety relief valve
Replace safety relief valve.
Leaking hose fitting
Tighten or replace fitting.
Leaking discharge valve
Replace pump body.
Leaking release assembly
Tighten release assembly.
Ram lock nut assembly not
Loosen retainer screw on ram
against cylinder
lock nut assembly, turn against
cylinder, and tighten retainer
screw.
Defective ram packing
Replace ram packing.
Jack will not lower load
Broken release assembly
Replace release assembly.
Bent ram
Replace cylinder and ram
assembly.
Ram lock nut not against
Loosen retainer screw on ram
cylinder
lock nut assembly, turn against
cylinder, and tighten retainer
screw.
Ram will not raise
Lack of hydraulic fluid
Service hydraulic system.
Clogged screen
Clean screen
Sticking intake or
discharge Operate pump handle rapidly to
valve ball
free sticking ball.
Open release assembly
Close release assembly.
Bent ram
Replace ram.
Ram will not rise to full
Lack of hydraulic fluid
Service system.
height
Clogged screen
Clean screen.
Closed air vent assembly
Open air vent assembly.
3-4

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