Download Tractor Maintenance: Enhance the performance of

Parts Information
Tractor Maintenance:
Enhance the performance of your air-conditioning!
Did you know that only a few regular checks are necessary to enhance the reliability and
performance of your air conditioning (AC) system? The following overview will provide an
outline of all necessary checks on the machine to boost the functionality of the system.
Finally the DO’S and DON’TS will show the important points to consider by maintaining the air
conditioning!
Refrigerant circuit layouts:
5020 Series Tractor
6020 Series Premium Tractor
6020 Series SE Tractor
Condenser:
Make sure the condenser fins are clean and straight. Proper airflow and 100 percent efficiency
are required for adequate cooling and compressor reliability. Failure to maintain the condenser
in good condition can result in inadequate cooling and compressor failure.
When cleaning the condenser, DO NOT use high-pressure washers. It is recommended to use
low-pressure water and compressed air. High-pressure washers can puncture the condenser
as well as bend condenser fins.
If the machine is equipped with a side-screen it may be necessary to clean it more than once a
day when operating in high debris conditions.
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Compressor belt:
Check the proper belt tension. A squealing sound is typically due to improper belt tension.
Most new machines have automatic tension, but it is still necessary to double-check it on a
regular basis.
Viscous fan drive:
If equipped, check the viscous fan drive of your tractor, and ensure that it is operating correctly
at all temperatures. This ensures proper airflow over the condenser and will lead to better
performance and longer reliability of system components.
Refrigerant charge:
It is strongly recommended to have the AC system serviced by a qualified technician. Low
refrigerant charge is only one of many potential causes of poor cooling.
It is strongly recommended that AC systems should NOT be topped off with refrigerant without
first knowing exactly what the remaining charge is in the system. Over-charging by just a few
grams/ounces can lead to high system pressure and eventual failure of the compressor or
clutch.
Cab air filter:
Proper maintenance of cab air filters is absolutely necessary for maximum performance of an
AC system. When recirculation air filters are plugged, or have never been serviced, the
tractor’s AC system is forced to attempt to cool 100 percent of the outside air. This is much
more difficult than cooling a mixture of recirculated air and outside air. Performance is
dramatically reduced with dirty cab air filters.
Proper maintenance of fresh air filters is recommended. When the fresh air filters are plugged,
or have never been serviced, the tractor’s AC is forced to run in recirculation air mode.
Refrigerants and oils
R134a (tetrafluorethane) is the only approved refrigerant for use in John Deere systems. This
substance does not contain any chlorine atoms, so it does not have a detrimental effect on the
ozone in the Earth’s atmosphere.
PAG oil is the only approved oil for use in John Deere systems. It mixes very well with the
refrigerant and provides ideal lubrication throughout the system.
John Deere testing has proven that the use of blended refrigerants or oils like Ester oil leads
to poor performance and significantly accelerated wear and deterioration of internal
compressor and system components.
Some unapproved blended refrigerants on the market are actually made from highly
flammable compounds like butane or propane and should not be used in AC systems.
Part No.
Description
QTY
FKM10447
Refrigerant R134a
750 ml
FKM10446
PAG compressor oil
250 ml
TY27506
Dye - R-134A fluorescent leak
detection
7 ml
TY25601
Air-conditioning system flush
3,79 l
Remarks
for use with R134a
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Overview - What to consider when maintaining
the air-conditioning system!
IMPORTANT: Please see your John Deere dealer for a
qualified inspection of the air-conditioning system!
DO
DO
Flush AC system when replacing any
component
9 Clean system and remove old oil
9 If not performed, liquid oil slugging can
lead to compressor failure
DON’T
DON’T
Use anything but John Deere approved
flushing agents
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The John Deere flush TY25601 is the
only non-flammable flush that leaves no
residue in the system when evacuated
All other solvents do not clean out
completely and contaminate the oil
DO
Use only R134a refrigerants
9 The only refrigerant approved by
John Deere
9 For best reliability and performance
DON’T
Use blended refrigerants
DO
Use only PAG oil
9 The only oil approved by John Deere
9 Provide superior internal protection of
AC system
DON’T
Use Ester oils
DO
Recharge refrigerant precisely by weight
9 Overcharging dramatically increases
system pressure and reduces thermal
performance
9 Please see technical manual for
correct weight
DON’T
Recharge using pressure gauges only
DO
Check all AC system wiring including the
correct voltage to the compressor clutch
9 A good 12 volt signal is essential to
properly engage the clutch and prevent
it from slipping
DON’T
Set the compressor unit on the clutch
DO
Clean the evaporator and condenser on a
regular basis. Maintain the cab filters
regularly (recirculation and fresh air filters).
DON’T
Operate with faulty or non-working blower fans
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Blends can cause poor performance
Using blends will void your compressor
warranty
Ester oils cause extremely accelerated
wear of AC system components
Using ester oils will void your
compressor warranty
The lag time in gauge reaction will
cause overcharge
Overcharging results in high system
pressures and poor cooling
Undercharging results in poor cooling
Because this could alter the clutch air
gap which might lead to slippage
Could also damage the front shaft seal
100 percent efficiency and maximum air
flow required for peak performance
(Remark: condenser and cab air filters except for activated carbon filters – should
also be cleaned by the farmer on a regular
basis).
9 100 percent efficiency and maximum
air flow required for peak performance
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