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TM 5-4210-233-14&P-1
4-188. TESTING HYDRAULIC SYSTEM
THIS TASK COVERS:
a.
Testing Hydraulic Pressure
b.
Testing Aerial Performance Times
EQUIPMENT CONDITION
Engine Running and warmed up to
normal operating temperature
a.
Testing Hydraulic Pressure.
(1) To test hydraulic system pressure, move the RUN/LOCK lever on the aerial control platform to the
RUN position.
(2) With all hydraulic controls in the neutral position (no hydraulic circuits actuated) the pressure indication
on the SYSTEM PRESSURE gauge should be 2150 psi (14814 kPa). Pressures higher or lower than
2150 psi (14814 kPa) indicate component failure. Troubleshoot system (refer to Table 4-2) to identify
fault. Replace or repair components as required.
b.
Testing Aerial Performance Times.
(1) With all outriggers fully extended and supporting the weight of the truck (see para 2-14.) perform the
following tests. Check the aerial performance times against the times listed below.
Raise ladder from 0° to 750 ............................
35 to 45 seconds
Lower ladder from 750 to 0°............................
35 to 45 seconds
Full left rotation (3600)....................................
130 to 140 seconds
Full right rotation (3600)..................................
130 to 140 seconds
Full extension .................................................
35 to 45 seconds
Full retraction .................................................
28 to 35 seconds
(2) Perform "three-function test". Push or pull all three aerial control levers simultaneously. Test the time
required to achieve 900 rotation, full elevation and full extension. Time required should be 1 05
seconds.
4-482
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