New Holland LS140 Workshop Manual page 282

PROBLEM
Hydraulic system hot
Oil filter indicator light stays on
SECTION 35 - HYDRAULIC SYSTEM
POSSIBLE CAUSE
Low oil flow pump
Main control valve linkage or spool
binding or damaged
Auxiliary boom hydraulic control
not in neutral
Hydraulic oil cooler restricted
Leaking cylinder packing
Main system relief valve low pres-
sure
Hydraulic attachment being over
used
Oil filter clogged
Incomplete circuit
Undersize tubes, hoses, or fittings
Filter base
35-13
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CORRECTION
Plugged inlet line, clean or replace
line
Check and correct linkage
Lock handle in neutral when not in
use
Clean oil cooler
Repair cylinders
Check main system pressure
Back off and let system cool down,
DO NOT operate at or close to relief
pressure
Change filter
Check the DKGN/O wire and con-
nections
Replace any undersize tubes,
hoses, or fittings
Replace if pressure differential
across filter is over 40 PSI