Servicing a New Holland TN-Series
Pictures are of a TN70. Concepts
apply to other models.
Before performing any of the following operations, be sure that engine is
stopped and has been given adequate time to cool down
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Fan Belt
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Check fan belt deflection to .39 -
.43 inches (10 – 11mm) with a load of 17.7 – 22.1 pounds (8 – 10 kg)
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To adjust tension, loosen the
screw, adjust tension, and tighten screw
Replace the belt if it is damaged
or requires adjustment frequently |
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Air Filter
When the air filter indicator light
illuminates, check the filter for clogging
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Remove ail cleaner cover
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Take primary filter out of
canister
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Clean with air pressure from the
inside to the outside at a pressure less than 84 psi
or
Clean with water and a non-foaming
detergent, rinse with water at less than 41 psi, and dry with air at less than
122°F
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Clean inside of container with a
damp cloth
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Reinstall air filter cartridge
Outer filter needs to be replaced
every year, or when cracks appear (check by putting a light inside the filter
and examining the outside)
Inner filter should be replaced
at the same time that the outer filter is replaced |
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Fuel Filter Condensation
Discharge
Discharge fuel filter condensation
by loosening the screw ¾ of a turn |
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Oil Sump
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Remove drain plug to drain oil
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Put drain plug back in
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Fill oil as needed
Oil sump should be drained after
every 300 hours of operation | |
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Changing Fuel Filter
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Unscrew fuel filter cartridge
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Replace with new cartridge
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Bleed fuel system
Oil filter should be replaced
after every 300 hours of operation
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Bleeding the Fuel System
System needs to be bled in the
following situations:
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Unscrew the bleed plug two turns
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Move lever until fuel without air
bubbles flows from bleed hole
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Tighten bleed plug
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Loosen fuel lines at all 3
injectors
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Move lever again until fuel
without air bubbles flows from bleed hole
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Tighten fuel lines
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Start engine and release key as
soon as engine starts
If engine does not start, repeat
above steps
If fuel system is being bled
because tractor has not been run for a long period of time, be sure to add a
protective fuel additive into the fuel at 10% of the amount of fuel. Then run
engine for about half an hour. | |
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Transmission and Services Oil
Filter
-
Unscrew old oil filter and discard
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Apply a small amount of oil to the
rubber seal of the new filter
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Tighten filter until it touches the mounting surface
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Tighten filter an additional ¾ turn by hand
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When a new filter is installed,
oil typically decreases a little. Ensure that oil does not leak through the
seal of the filter, then refill oil as needed.
Transmission and services oil
filter should be replaced after every 300 hours of operation |
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Power Shuttle Oil Filter
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Unscrew old oil filter and discard
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Apply a small amount of oil to the
rubber seal of the new filter
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Tighten filter until it touches the mounting surface
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Tighten filter an additional ¾ turn by hand
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When a new filter is installed,
oil typically decreases a little. Ensure that oil does not leak through the
seal of the filter, then refill oil as needed.
Power shuttle oil filter should
be replaced after every 300 hours of operation | |
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Engine Oil Filter
-
Unscrew old oil filter and discard
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Apply a small amount of oil to the
rubber seal of the new filter
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Tighten filter until it touches the mounting surface
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Tighten filter an additional ¾ turn by hand
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When a new filter is installed,
oil typically decreases a little. Ensure that oil does not leak through the
seal of the filter, then refill oil as needed.
Engine oil filter should be
replaced after every 300 hours of operation |

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Draining the Fuel Tank
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Park tractor on a level surface
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Make sure that engine is turned
off
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Remove drain plug to drain fuel
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Reinstall drain plug
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Refill fuel tank
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Bleed fuel system
Drain fuel tank after every 1200
hours of work, or every year, whichever comes first | |
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Changing 4WD Front Axle Housing
Oil
-
Unscrew drain plug to drain oil
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Reinstall drain plug
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Fill with new oil through the
filler plug until oil level reaches the bottom of the filler plug hole
Change oil after every 1200 hours
of work, or every two years, whichever comes first |
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Changing 4WD Front Axle Final
Drives Oil
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Rotate wheel until drainage plug
is at the lowest possible point
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Remove plug to drain oil
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Fill with new oil (through the
same hole that oil drained through) until oil level reaches the bottom of
the hole
Change oil after every 1200 hours
of work, or every two years, whichever comes first |
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Changing Transmission And Lift
Oil
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Remove drain plugs (4) and drain
oil
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Reinstall drain plugs
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Refill oil through dipstick hole
Change oil after every 1200 hours
of work, or every two years, whichever comes first | |
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