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Page Title:
FAN DOES NOT OPERATE AT HIGH 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 valve.
(5) Install high speed fan lockout
differential pressure sensing valve.
NOTE
Use drain pan to catch leaking hydraulic oil.
VISUAL INSPECTION
(1) Remove low speed fan differential
pressure sensing valve from
multifunction manifold.
(2) Remove and discard two packing
retainers and five preformed
packings.
(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 two packing
retainers and five preformed
packings and install on valve.
(5) Install low speed fan differential
pressure sensing valve.
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