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


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Figure 3-1. Test Stand Packing/Unpacking - TM-55-4920-373-14-P0033
TM-55-4920-373-14-P Gasoline Engine Driven Hydrualic Systems Test Stand Type D5-B Manual
Figure 3-2. Test Stand Engine and Access Points - TM-55-4920-373-14-P0035
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
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
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
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
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.
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
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
hydraulic system, proceed as follows:
14. Shut down the test stand (refer to Chapter
1. Drain any preservative fluid (item 3, table
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.

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