HYDRAULIC SYSTEM - TM-55-4920-373-14-P0034

TM 55-4920-373-14&P

3. When hydraulic reservoir fluid level indica-

in each opening and then repeating until aIl ceils

are filled. Any available water may be used but

tor (item 12, figure 2-1) registers full, stop

contaminated water might shorten battery life.

filling reservoir.

Sea water should be used only in an emergency

NOTE

and only in a well ventilated area.

Do not overfill the hydraulic reservoir.

5. Reopen flip

caps, check that liquid level is

The expansion space in the reservoir is

at bottom of vent

tube in each cell. If not, add

necessary for satisfactory test stand

opening to bring liquid level

water in initial fill

operation.

to bottom of vent

tube. Do not overfill.

6. Replace the Initial Fill Cap filler plugs

4. Open test stand reservoir shutoff valve

securely; never remove again.

(item 15, figure 2-l).

7. Charging is not normally needed before

5. Open bleed valve on low pressure filter

installation. If battery fails to crank engine, it

(item 8, figure 1-3).

is probably due to rapid filling. Allow a fifteen

6. A steady flow of fluid indicates absence of

to thirty minute wait.

air. Close bleed valve when this occurs.

8. If battery still fails to crank, remove from

NOTE

test stand and charge as follows:

If difficulty is experienced in bleeding,

a. Charge battery with 12 VDC at a rate of

the probable cause is a clogged filter

three amperes for approximately ten hours.

element. Check and replace filter ele-

ment in accordance with paragraph 3-9.

b. Perform four consecutive hourly readings

upon completion of battery charge, observing the

7. Connect 1/2 inch hose to 1/2 inch test stand

specific gravity with a hydrometer. Each cell

outlet.

of a properly charged battery shall indicate a

specific gravity of 1.285 to 1.300. A discharged

8. Open 1/2-inch flow control valve (item 16,

cell has a specific gravity of 1.150 to 1.175.

figure 2-1).

Intermediate values indicate the relative propor-

tion of a full charge. The voltage reading shall

9. Set selector outlet valve (item 17, figure

be 12 1.2 VDC.

2-1) from vertical position to 1/2 inch position.

9. Reinstall battery in test stand.

10. Remove cap from test stand reservoir

filler neck.

3-8. FUEL SYSTEM. Fill the gasoline engine

fuel system with Specification MIL-G-3056 or

11. Remove coupling from opposite end of

MIL-F-5572 grade fuel.

connected 1/2 inch hose and insert into reservoir

filler taking care not to damage the strainer

WARNING

screen and prepare to pump fluid into reservoir.

Always provide earth grounding to filling

12. Set fluid volume control (item 20, figure

container and test stand fuel tank before

2-1) at 2 GPM and zero pressure as registered

filling tank, to prevent sparks. Do not

fill near flames or glowing hot objects.

by the fluid pressure gage (item 9, figure 2-1).

1. Insure the shutoff cock (See figure 3-2.) is

13. Start up test stand (refer to Chapter 2;

Section IV, paragraph 2-10 and 2-11 as applicable)

opened and check the fuel strainer for leaks.

and pump fluid through system back into reser-

voir (item 5, figure 1-3) until no trace of air is

3-9. HYDRAULIC SYSTEM. To prepare the

observed.

hydraulic system, proceed as follows:

14. Shut down the test stand (refer to Chapter

1. Drain any preservative fluid (item 3, table

2, Section IV paragraph 2-13).

1-7) from the system by removing drain plug,

from the low pressure filter. Replace plug.

15. Remove hose from reservoir, reconnect

coupling removed from hose and disconnect hose

from test stand.

2. Fill test stand reservoir with hydraulic

fluid, (item 2, table 1-7) by removing caps from

16. Check for hydraulic fluid leaks.

filter neck on hydraulic reservoir.

3-3