TM 5-3805-248-23-2
HYDRAULIC SYSTEM FLOW METER TEE TEST AND MAINTENANCE - CONTINUED
0321 00
BLOCKED CIRCUIT TESTS - CONTINUED
Bowl Lower Flow Rate (Leakage Rate).
5.
a.
Block bowl circuit with a blocking plate at circuit line.
b.
Open manual load valve on flow meter fully.
c.
Start engine and run at 1,900 RPM. Move bowl control lever into the LOWER position.
d.
Slowly adjust manual load valve on flow meter for a pressure of 1,000 psi (6,895 kPa).
e.
Record flow rate. Refer to Table 3. Correct bowl lower flow rate is 68 gpm (257 l/min).
Apron Up Flow Rate (Leakage Rate).
6.
a.
Block apron circuit with a blocking plate at circuit line.
b.
Open manual load valve on flow meter fully.
c.
Start engine and run at 1,900 RPM. Move apron control lever into the UP position.
d.
Slowly adjust manual load valve on flow meter for a pressure of 1,000 psi (6,895 kPa).
e.
Record flow rate. Refer to Table 3. Correct apron up flow rate is 68 gpm (257 l/min).
Apron Down Flow Rate (Leakage Rate).
7.
a.
Block apron circuit with a blocking plate at circuit line.
b.
Open manual load valve on flow meter fully.
c.
Start engine and run at 1,900 RPM. Move apron control lever into the DOWN position.
d.
Slowly adjust manual load valve on flow meter for a pressure of 1,000 psi (6,895 kPa).
e.
Record flow rate. Refer to Table 3. Correct apron down flow rate is 68 gpm (257 l/min).
System Oil Temperature (Finish).
8.
a.
Open manual load valve on flow meter fully.
b.
Start engine and run at 1,900 RPM. Move ejector control lever into FORWARD position.
c.
Record oil temperature. Refer to Table 3. System oil temperature should be between 145 and 155F (63 and
68C).
d.
Tests 25 through 30 are more than rates shown in Table 3.
(1)
Check hydraulic control relief valve.
(2)
If hydraulic control relief valve is damaged or defective; service or replace. Refer to WP 0323 00 and WP
e.
Tests 25 and 26 indicate leakage in ejector circuit.
(1)
Check ejector cylinder.
(2)
If ejector cylinder is damaged or defective; service or replace. Refer to WP 0384 00.
f.
Tests 27 and 28 indicate leakage in bowl circuit. Check bowl circuit.
(1)
If bowl cylinders are damaged or defective; service or replace. Refer to WP 0383 00.
(2)
If cause of flow loss is not identified; proceed to Tests 36 through 41.
g.
Tests 29 and 30 indicate leakage in apron circuit. Check apron cylinder.
(1)
If apron cylinder is damaged or defective; service or replace. Refer to WP 0385 00.
(2)
If cause of flow loss is not identified, proceed to Tests 43 and 44.
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