TM 5-3805-248-23-2
HYDRAULIC SYSTEM FLOW METER TEE TEST AND MAINTENANCE - CONTINUED
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COMPARISON OF BLOCKED CIRCUIT TESTS
1.
Bowl Raise Flow Rate (Bowl Circuit Blocked).
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 RAISE 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 4. Correct bowl raise flow rate is 68 gpm (257 l/min).
2.
Bowl Raise Flow Rate (Right Bowl Control Circuit Blocked).
a.
Block right bowl control circuit with a blocking plate.
b.
Open manual load valve on flow meter fully.
c.
Start engine and run at 1,900 RPM. Move bowl control lever into the RAISE 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 4. Correct bowl raise flow rate is 68 gpm (257 l/min).
3.
Bowl Lower Flow Rate (Right Bowl Control Circuit Blocked).
a.
Block right bowl control circuit with a blocking plate.
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 4. Correct bowl lower flow rate is 65.5 gpm (248 l/min).
4.
Bowl Raise Flow Rate (Right Cylinder And Balance Line Blocked).
a.
Block right cylinder and balance line with blocking plates.
b.
Open manual load valve on flow meter fully.
c.
Start engine and run at 1,900 RPM. Move bowl control lever into the RAISE position.
d.
Slowly adjust manual load valve on flow meter for a pressure of 1,000 psi (6,895 kPa).
e.
Record flow rate.
BLOCKED COMPONENTS TEST
If Blocked Circuit Tests indicate that leakage is too high in cylinder valves or swivel joint, Blocked Component Tests
are performed.
1.
System Oil Temperature (Start).
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 4. System oil temperature should be between 145 and 155F (63 and
68C).
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