TM 5-3805-248-23-2
HYDRAULIC SYSTEM FLOW METER TEE TEST AND MAINTENANCE - CONTINUED
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COMPARISON OF SYSTEM TESTS
a.
Test reading is higher or lower than Maximum Pressure Relief Valve Setting (Test 1) and Percent Flow Loss (Tests
4 through 9) is different by 15 to 50 percent.
(1)
Check hydraulic control relief valve setting.
(2)
If setting is incorrect, make adjustments to obtain correct setting. Refer to WP 0323 00 and WP 0381 00.
(3)
If hydraulic control relief valve is functioning properly, test hydraulic implement pump using flow meter.
Refer to Hydraulic Implement Pump Test.
b.
Flow loss (Tests 4 through 9) is greater than percent shown in Table 1.
(1)
Test hydraulic implement pump for proper operation. Refer to Hydraulic Implement Pump Test.
(a) If hydraulic implement pump is damaged or defective, replace.
(b) If hydraulic implement pump is operating properly, go to step 2.
(2)
Check sequence valve for leakage.
(a) If sequence valve is leaking, stop leakage. Refer to WP 0382 00.
(b) If no leakage is present, go to step 3.
(3)
Check hydraulic control valve spools and valve body for damage and wear.
(a) If hydraulic control valve and valve body is damaged or defective, adjust, service or replace. Refer to
(b) If control valve spools and valve body are functioning, go to step 4.
c.
Flow loss for Tests 4 and/or 5 is more than 15 percent; flow loss for Tests 6, 7, 8 and 9 is less than percent shown
in Table 1.
(1)
Check hydraulic control valve body and spool for damage or wear.
(a) If hydraulic control valve body and spool are damaged or defective, adjust, service or replace. Refer to
(b) If hydraulic control valve body and spools are functioning, proceed to step 2.
(2)
Check ejector cylinder piston seals for leakage.
(a) If leakage is present, refer to WP 0384 00.
(b) If no leakage is present, perform Blocked Circuit Tests 26 and 27, in Troubleshooting, paragraph h.
(c) After performing Blocked Circuit Tests 26 and 27 and if flow rates exceed 68 gpm (257 l/min) replace
or repair ejector control valve. Refer to WP 0323 00 and WP 0381 00.
d.
Flow loss for Tests 6 and 7 is more than the percent shown in Table 1; flow loss for Tests 4, 5, 8 and 9 is less than
percent shown in Table 1.
(1)
Check bowl cylinder piston seals for leakage (Figure 10-7).
(a) If leakage is present, refer to WP 0384 00. If no leakage is present, go to step 2.
(2)
Check hydraulic control valve body and spools for damage and wear.
(a) If hydraulic control valve spools and body are damaged or defective, service or replace.
(b) If hydraulic control valve is functioning, proceed to next step.
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