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TM 5-2420-222-34
14-1.
HYDRAULIC SYSTEM TEST.
This Task Covers: Test
Initial Setup:
Tools/Test Equipment:
Materials/Parts:
•
General mechanic's tool kit
•
Rags (Item 28, Appendix B)
•
Field automotive shop set
•
Hydraulic system tester
References:
•
TM 5-2420-222-10
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TM 5-2420-222-20
TEST
WARNING
•
Do not attempt to disconnect hydraulic hoses and fittings while engine Is
running or before hydraulic system pressure has been released. When
engine Is running, hydraulic system Is under pressure. Hydraulic system
pressure should be 0 psi (0 kPa) before lines are disconnected. A line or
fitting disconnected under pressure will spray hydraulic fluid with force and
may cause serious injury to personnel.
•
Be careful when draining hot fluids. Wear gloves to protect your hands
from hot parts and fluids. Severe burns could result.
NOTE
•
Purpose of test is to give Indication of no flow condition for entire hydraulic
system. Flow Indication from hydraulic system tester will require hydraulic
components to be Isolated and checked for leakage.
•
Backhoe test may be Isolated by performing steps 14 through 39 and
connecting the hydraulic system tester to the backhoe.
•
Use a drain pan to catch fluid when disconnecting hydraulic hoses. Clean
up all spills.
1.
Release hydraulic system pressure (see TM 5-2420-222-20).
2.
Disconnect hose (1) from special tee (2).
3.
Connect hydraulic system tester to hose (1) and special tee (2).
4.
Start engine assembly and run at 2500 rpm (see TM 5-2420-222-10). Run engine until operating temperature is
170-F-190-F (77°C-88oC).
5.
Check connections of hydraulic system tester, hose (1), and special tee (2) for leaks. Tighten any leaking
connections.
6.
Position all loader backhoe hydraulic levers in neutral (see TM 5-2420-222-10).
7.
Check hydraulic system tester for indication of no flow. If flow Is present, individual components must be isolated
and checked for leakage.
8.
Shut down engine assembly (see TM 5-2420-222-10).
14-2
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