BOOM DOES NOT RAISE OR RAISES SLOWLY. (Cont) -726250681

TM 9-2320-364-34-1

High pressure hydraulics [oil under 3000 psi (20,685 kPa) pressure] operate this equipment. Refer to

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. To avoid injury, wipe up spilled fuel or oil with rags.

NOTE

Use a drain pan to catch leaking hydraulic oil.

FLOWMETER TEST

(1) Disconnect hose 2918 from main

hydraulic filter.

(2) Connect adapter hose to filter.

(3) Connect adapter hose to flowmeter

OUT port.

(4) Connect adapter hose to hose 2918.

(5) Connect adapter hose to flowmeter

IN port.

(6) Open flowmeter load valve.

(7) Start engine (TM 9-2320-364-10).

(8) Set WINCH/CRANE switch to

CRANE position.

(9) Set hydraulic selector switch to

CRANE/SRW position.

(10) Set crane POWER switch to

ON position.

(11) Observe and record gpm (lpm)

measured.

(12) Hold BOOM control lever in UP

position.

(a) If an increase in flow is not

present, perform Steps (13)

through (18) below and replace

BOOM valve on four valve bank

(Para 16-26).

(b) If an increase in flow is

measured, perform Steps (13)

through (18) below and replace

OSS directional valve on four

valve bank (Para 16-26).

(13) Set crane POWER switch to

OFF position.

(14) Set hydraulic selector switch to OFF

position.

(15) Turn OFF ENGINE switch.

(16) Disconnect adapter hose from

hose 2918. Discard preformed

packing.

(17) Disconnect adapter hose from

return filter. Discard preformed

packing.

(18) Connect hose 2918 with preformed

packing to filter.

2-597