TM 5-3805-248-23-2
HYDRAULIC SYSTEM FLOW METER TEE TEST AND MAINTENANCE - CONTINUED
0321 00
HYDRAULIC IMPLEMENT PUMP TEST-AERATION AND CAVITATION FOR TESTS 17-23 - CONTINUED
4.
Test 20.
a.
Open manual load valve on flow meter fully.
b.
Start engine and run at 1,300 RPM.
c.
Slowly adjust manual load valve on flow meter for a pressure of 1,000 psi (6,895 kPa).
d.
Record oil temperature and flow rate. Refer to Table 2. Correct oil temperature is between 145 and 155F (63
and 68C). Correct flow rate is 47 gpm (214 l/min).
5.
Test 21.
a.
Open manual load valve on flow meter fully.
b.
Start engine and run at 1,500 RPM.
c.
Slowly adjust manual load valve on flow meter for a pressure of 1,000 psi (6,895 kPa).
d.
Record oil temperature and flow rate. Refer to Table 2. Correct oil temperature is between 145 and 155F (63
and 68C). Correct flow rate is 55 gpm (250 l/min).
6.
Test 22.
a.
Open manual load valve on flow meter fully.
b.
Start engine and run at 1,700 RPM.
c.
Slowly adjust manual load valve on flow meter for a pressure of 1,000 psi. (6,895 kPa).
d.
Step 4. Record oil temperature and flow rate. Refer to Table 2. Correct oil temperature is between 145 and 155F
(63 and 68C). Correct flow rate is 63 gpm (239 l/min).
7.
Test 23.
a.
Open manual load valve on flow meter fully.
b.
Start engine and run at 1,900 RPM.
c.
Slowly adjust manual load valve on flow meter for a pressure of 1,000 psi (6,895 kPa).
d.
Record oil temperature and flow rate. Refer to Table 2. Correct oil temperature is between 145 and 155F (63
and 68C). Correct flow rate is 71 gpm (269 l/min).
CAUTION
Immediately after stopping the engine, remove the blocking plate assembly from the pressure line for the
pump to prevent any possible damage later.
COMPARISON OF AERATION AND CAVITATION TESTS
a.
Flow loss for Test 14 is 10 percent or more; flow differential for Test 14 is higher than flow differential for Test 16
by 2 gpm or more; Tests 17 through 23 have the same flow differential.
(1)
Check oil level and type of hydraulic oil being used.
(a) If incorrect oil is being used, drain hydraulic tank and refill with correct oil to proper level. Refer to
TM 5-3805-248-10.
(b) If oil level is too low, fill hydraulic tank to correct level. Refer to TM 5-3805-248-10.
(c) If correct type of oil is used and level is satisfactory, go on to step 2.
(2)
Remove cover from hydraulic tank and check for leaks.
(a) If leakage is present, refer to (WP 0233 00).
(b) If no leakage is present, go to step 3.
0321 00-10
