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TM 5-2420-222-34
14-1.
HYDRAULIC SYSTEM TEST (Con’t).
NOTE
Steps 15 through 18 apply only to loader backhoes with serial numbers 235786-
235999.
15.
Disconnect return hose fitting (3) from adapter (4).
16.
Connect hydraulic system tester to return hose fitting (3) and adapter (4).
17.
Disconnect pressure hose fitting (6) from adapter (5).
18.
Connect hydraulic system tester to pressure hose fitting (6) and adapter (5).
NOTE
Steps 19 through 22 apply only to loader backhoes with serial numbers 319995-
342573.
19.
Disconnect return hose fitting (8) from adapter (7).
20.
Connect hydraulic system tester to return hose fitting (8) and adapter (7).
21.
Disconnect pressure hose fitting (9) from adapter (10).
22.
Connect hydraulic system tester to pressure hose fitting (9) and adapter (10).
23.
Start engine assembly and idle at 2500 rpm (see TM 5-2420-222-10). Run engine assembly until operating
temperature Is 170àF-190°F (77°C-88°C).
24.
Check all connections between hydraulic system tester and backhoe for leaks. Tighten any leaking
25.
Check hydraulic system tester for indication of no flow. If flow is present, individual components must be isolated
and checked for leakage.
26.
Shut down engine assembly (see TM 5-2420-222-10).
27.
Release hydraulic system pressure (see TM 5-2420-222-20).
NOTE
Steps 28 through 31 apply only to loader backhoes with serial numbers 235786-
235999.
28.
Disconnect hydraulic system tester from return hose fitting (3) and adapter (4).
29.
Connect return hose fitting (3) to adapter (4).
30.
Disconnect hydraulic system tester from pressure hose fitting (6) and adapter (5).
31.
Connect pressure hose fitting (6) to adapter (5).
NOTE
Steps 32 through 35 apply only to loader backhoes with serial numbers 319995-
342573.
32.
Disconnect hydraulic system tester from return hose fitting (8) and adapter (7).
14-4
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