Section II. CHECKOUT AND ANALYSIS

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

table

4-1

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.

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.

with paragraph 3-27 b.

a. Remove socket pin assembly (2, figure 3-2) from

pump handle socket (5) by removing chain (3) and

screws (4).

4-2