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Page Title: FAN SPEED DOES NOT DECREASE FROM HIGH TO LOW SPEED. (Cont)
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TM 9-2320-364-34-1
High pressure hydraulics [oil under 3675 psi (25,339 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 drain pan to catch leaking hydraulic oil.
VISUAL INSPECTION
(1) Remove high speed fan lockout
differential pressure sensing valve
from multifunction manifold.
(2) Remove and discard three preformed
packings and four packing retainers.
(3) Push plunger inside valve with a non-
metallic probe.
(a) If plunger sticks and does not
move freely up and down, replace
differential pressure sensing valve
(Para 17-18).
(b) If plunger moves freely up and
down, differential pressure
sensing valve is OK.
(4) Lubricate three preformed packings
and four packing retainers with
hydraulic oil and install on differential
pressure sensing valve.
(5) Install high speed fan lockout
differential pressure sensing valve.

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