BOOM DOES NOT OPERATE OR OPERATES SLOWLY. (Cont) -726250705

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.

VISUAL INSPECTION

(1) Remove four valve bank from

crane (Para 16-26).

(2) Remove BOOM valve from

four valve bank (Para 16-26).

(3) Remove orifice from four valve bank

where BOOM valve was removed

from (Para 16-26).

(4) Inspect orifice for contamination

clogging it.

(a) If orifice is contaminated, clean

or replace orifice and inspect

bores in BOOM valve for

(b) If orifice is OK, repair BOOM

valve on four valve bank

(Para 16-33).

(5) Install orifice on four valve

bank (Para 16-26).

(6) Install BOOM valve on four

valve bank (Para 16-26).

(7) Install four valve bank on crane

(Para 16-26).