TM 5-3805-248-23-2
HYDRAULIC SYSTEM FLOW METER TEE TEST AND MAINTENANCE - CONTINUED
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PREPARATION FOR SYSTEM TEST - CONTINUED
WARNING
Manual load valve on flow meter must be fully open before starting engine. Failure to follow this procedure
may cause injury. If you are injured, obtain medical help immediately.
f.
Open manual load valve on flow meter fully.
g.
Start engine and run at 1,900 RPM.
h.
Slowly adjust manual load valve on flow meter to a pressure of 1,000 psi (6,895 kPa).
i.
Check oil temperature.
j.
When oil temperature reaches 100F (38C), adjust manual load valve on flow meter to a pressure of 1,500 psi
(10,342 kPa).
k.
Move all hydraulic control levers several times.
l.
Check oil temperature.
m.
When oil temperature reaches 160F (71C), move cylinders through their cycles until temperature throughout
system is lowered to 150F (66C).
SYSTEM TESTS
1.
Maximum Pressure Relief Valve Setting.
NOTE
Before recording test data, make sure conditions in hydraulic system are constant. Refer to Preparation for
Test.
a.
Open manual load valve on flow meter fully.
b.
Start engine and run at 1,900 RPM. Move ejector control lever forward.
c.
Slowly close manual load valve until oil flow through flow meter stops (zero gpm).
d.
Record pressure. Refer to Table 1. Maximum pressure relief valve setting is between 2,100 and 2,200 psi (14,479
and 15,168 kPa).
2.
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 forward.
c.
Record oil temperature. Refer to Table 1. System oil temperature should be between 145 and 155F (63 and
68C).
d.
For pressures higher than 1,000 psi (6,895 kPa), slowly open manual load valve before releasing control lever.
3.
System Base Flow Rate.
a.
Open manual load valve on flow meter fully.
b.
Start engine and run at 1,900 RPM. Move ejector control lever forward.
NOTE
Before recording test data, make sure system pressure is at least 100 psi (689 kPa).
c.
Record flow rate. Refer to Table 1. Correct system base flow rate is 70 gpm (265 l/min).
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