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Page Title:
MAST DOES NOT OPERATE OR OPERATES SLOWLY. (Cont) |
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 TM 9-2320-364-34-1
High pressure hydraulics [oil under 3000 psi (20,685 kPa) pressure] operate this equipment. Refer to
S
vehicle operator and maintenance manuals for hydraulic oil pressure. Never disconnect any hydraulic
line or fitting without first dropping pressure to zero. Failure to comply may result in injury to personnel.
Fuel and oil are slippery and can cause falls.
S
To avoid injury, wipe up spilled fuel or oil
with rags.
NOTE
Use a drain pan to catch leaking hydraulic
oil.
FLOW/PRESSURE TEST
(1) Tag, mark and disconnect hose
from fitting at bottom of MAST
valve. Discard preformed packing.
(2) Plug hose with metal plug.
(3) Tag, mark and disconnect hose
from elbow at bottom of MAST
valve. Discard preformed packing.
(4) Plug hose with metal plug.
(5) Connect adapter hose with
preformed packing to elbow.
(6) Connect adapter hose to flowmeter
OUT port.
(7) Connect adapter hose with
preformed packing to fitting.
(8) Connect adapter hose to flowmeter
IN port.
(9) Open flowmeter load valve.
(10) Start engine (TM 9-2320-364-10).
(11) Set WINCH/CRANE switch to
CRANE position.
(12) Set hydraulic selector switch to
CRANE/SRW position.
(13) Set crane POWER switch to
ON position.
(14) Hold MAST control lever in UP
position.
(a) If 6 gpm (23 lpm) or more
are not present, perform
Steps (15) through (20) below
and replace MAST valve on
three valve bank (Para 16-27).
(b) If at least 6 gpm (23 lpm) are
present, three valve bank is OK.
(15) Set crane POWER switch to
OFF position.
(16) Set hydraulics selector switch to
OFF position.
(17) Turn OFF ENGINE switch.
(18) Disconnect adapter hoses from
elbow and fitting. Discard
preformed packings.
(19) Remove plugs from hoses.
(20) Connect two hoses with preformed
packings to elbow and fitting.
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