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Chapter 4. DIRECT AND GENERAL SUPPORT MAINTENANCE INSTRUCTIONS - TM-55-1730-208-130033
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TM-55-1730-208-13 Jack Hydraulic Part Number 50J25178 (TYPE B6) Manual
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Inspection and Repair.
TM 55-1730-208-13
Section II. CHECKOUT AND ANALYSIS
e. Bleed off proof pressure and remove hose from
4-1. Introduction.
hydrostatic test unit.
This section provides detailed instructions for
f. Reject hose if leakage is noted.
pressure testing the high pressure hose assembly (39,
figure 3-3) and troubleshooting the hydraulic jack at
g. Clean serviceable hose in accordance with
direct support maintenance level.
paragraph 3-34 and cap hose fittings if hose is not to be
installed immediately.
4-2. Hose Pressure Testing.
h. Install metal identification tag (item 7, table 1-2).
Pressure test hose assembly in accordance with the
Mark metal identification tag by impression stamping,
following procedures:
engraving, or etching to show part number, operating
pressure, and date of pressure test.
a. Clean hose in accordance with paragraph 3-34.
b. Remove metal identification tag from hose.
4-3. Troubleshooting Data.
c. Connect hose to hydrostatic test unit filled with
Refer
to
for direct
support
troubleshooting data applicable to 'the hydraulic jack.
hydraulic fluid (item 4, table 1-2).
d. Apply a proof pressure of 5000 psi to hose.
Pressure test for not less than 30 seconds and not more
than 5 minutes.  Check hose and hose fittings for
evidence of leakage.
Table 4-1. Direct Support Troubleshooting Data
PROBABLE
POSSIBLE
MALFUNCTION
CAUSE
REMEDY
Hydraulic jack fails to raise
Defective ram preformed
Replace ram preformed packing.
capacity load.
packing.
Defective pump body preformed
Replace pump body preformed
packing.
packing.
Hydraulic jack fails to support
Defective ram prepacking.
Replace ram preformed packing.
load.
Ram will not raise or lower load.
Bent ram.
Replace ram.
Section III. REPAIR PROCEDURES.
4-4. Introduction.
b. Remove pump handle socket (5), piston pin (6),
and piston pin roller (7) from pump piston (16).
This  section  provides  detailed  disassembly,
inspection, repair, and
reassembly
instructions
c. Remove vent assembly (9) from reservoir (12)
authorized by appendix B, maintenance allocation chart
in accordance with paragraph 3-27 a.
for direct support level maintenance.  For removal,
d. Remove plug (10) from reservoir (12).
cleaning, and replacement, refer to chapter 4, section
VI.
e. Remove pump piston (16) from pump cylinder
by removing screws (18) and chain (17).
4-5. Disassembly.
f. Remove retaining ring (19), felt (201, packing
Disassemble the pump assembly, and cylinder and
nut (21), packing retainer (22), and preformed packing
ram assembly as follows:
23) from pump body 38). Discard preformed packing.
g. Remove safety relief valve (24) in accordance
4-6. Pump Assembly.
a. Remove socket pin assembly (2, figure 3-2) from
pump handle socket (5) by removing chain (3) and
screws (4).
4-2

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