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REPLACEMENT.
Up
TM-55-1730-221-12 10 Ton Hydraulic Aircraft Hand Jack Type A-6 Part No. 53D22004 Manual
T.O. 35A2-2-39-11
T M 55-1730-221-12
3-14. TEST STAND. The test stand shall be used for
Part  and
adjustments and tests outlined in paragraphs 3-11 and
Index No.
3 - 1 5 through 3-17, and shall consist of the following:
Description
a. A hydraulic or pneumatic actuating cylinder with
0.496
Minor
diameter
---
Piston (8)
a 12 ton maximum load capacity and a source of
0.507
---
ID
Nut (9)
hydraulic or air pressure equipped with an adjustable
relief valve to operate the cylinder.
0.502
---
Minor ID
B o d y (12)
b. A platform type weighing scale calibrated to
3.496
---
ID
Bushing (31)
24,000 pounds for load measurement. Mount cylinder
(refer to paragraph 3-4a) in a stationary, vertical
Outer wear surfaces
---
3.487
Ram (33)
position, and place scale directly beneath, so that
jack can be positioned between cylinder and scale.
2.991
---
Major inner wear
T h e s e components shall be positioned so that thirteen-
surface  diameter
inch compression of cylinder ram is permitted.
2.793
---
Minor inner wear
3 - 1 5 . LEAKAGE TEST. Place jack in test stand (refer
surface  diameter
to paragraph 3-14).  Operate handle (1) to lift rams
( 3 3 , 39, 44) to contact cylinder. Adjust cylinder load-
---
3.667
Bearing (35)
OD
i n g to provide 20,000 pound (ten-ton) reading on scale.
With this load applied to jack, operate handle until
2.784
Outer wear surface
---
Ram (39)
the third-stage ram is partially extended. Visually
diameter
i n s p e c t jack for fluid leakage at pump packing nut (9),
2.364
---
Major inner wear
release valve (25), and rams. There shall be no fluid
surface  diameter
leakage at any point. After test, open release valve
( 2 5 ) to lower jack.
2.147
---
Minor inner wear
surface  diameter
3-16. OPERATING FORCE TEST. Apply ten ton load
to jack. Operate handle (1), applying force perpen-
---
2.980
OD
Bearing (41)
dicularly to axis of handle. Operating force required
during compression (downward) stroke shall be from
Ram (44)
75 to 80 pounds.
3-17. SETTLING TEST. Apply ten ton load to jack
Bearing (46)
and operate handle (1) to raise rams against load.
Settling at this load shall not exceed 0.020 inch per
3.678
---
Cylinder  wear
Base assem-
hour.
Perform this test twice with a 15-minute
b l y (56)
surface ID
interval between each test. Settling shall not exceed
0.005 inch at the end of each 15-minute period, a
t o t a l maximum of 0.010 inch at the end of the 30-min-
Open release valve (25) to lower jack
ute  period.
Wear
Tolerance
after completion of tests.
*U.S. GOVERNMENT PRINTING OFFICE: 1993-342-421/80363
3-5 and 3-6

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