Tractor Air Conditioning Service Shropshire & Mid Wales

Mobile service and repair of tractor cab air conditioning systems on farm for the Agricultural industry

Tractor Air Conditioning Mobile Service covers Shrewsbury, Oswestry, Whitchurch, Telford, Shropshire and Welshpool Mid Wales areas.

Telephone Mobile 07703 558610 www.autoelectrics.net

AIR CONDITIONING SERVICE FOR TRACTOR * SELF PROPELLED HARVESTER * COMBINE * CROP SPRAYER * TELEHANDLER * FARM VEHICLES

Agricultural machinery cab air conditioning is designed to cool and remove hot air from the tractor cab interior. Reducing in cab temperature aids tractor driver comfort and alertness during road field and harvest operations increasing safety.

Modern tractors have increased cab glass area aiding all round visibility. Tractor cab doors and windows need to remain closed to reduce noise, dust and pollution levels during field operations. Sunlight radiation via cab glass raises in cab temperatures to unbearable hot,combined with engine and drive line heat which further increases cab and operator temperature.

Working tractor air conditioning systems improve the operator in cab environment by recirculating and reducing cabin air temperature and removing dusts and pollen.

Tractor air conditioning refrigerant recovery and regas

All air conditioning systems require periodic servicing.
Refrigerant type R134a is used in many tractor air conditioning systems including Agco, Case, Caterpillar, Claas, Deutz, Massey Ferguson, JCB, John Deere, Kubota, New Holland, Valtra.
R134a is a HFC refrigerant with global warming potential (gwp) of 1430 requiring recovery by FGAS certified personnel prior to disassembly of a tractor aircon system.
We have facilities to recover R134a refrigerant from tractor air conditioners, pressure test, and regas.
Manufacturers recommend specific quantities of refrigerant to recharge tractor air conditioning systems, capacity of cab air conditioners is usually in the region of 900 to 1600 grams depending on system.

Refrigerant charge levels may need to be checked by recovering refrigerant and weighing recovered refrigerant quantity. Lubricant is added to the air conditioning system during regas.

Tractor Air Conditioning Compressor

The tractor aircon compressor is normally belt driven via auxiliary belt from the crankshaft pulley.

* Service Part * Drive belt condition should be inspected and replaced as necessary

Many air conditioning compressors are fitted with an electromagnetic clutch which operates to engage or disengage compressor drive.

During air conditioner operation the aircon compressor sucks in refrigerant gas at low pressure and discharges gas at high pressure.
Increase of refrigerant gas pressure also increases refrigerant temperature.
Low refrigerant charge presssure or too high refrigerant pressure may prevent the compressor from operating.
Air conditioning compressor clutch engagement is electrically controlled.
The air conditioner electrical system will be fitted with an evaporator temperature control thermostat, also high pressure and low pressure cut out switches to monitor refrigerant pressure.
Control relays will swich in blower and condenser fan motors and compressor clutch.

Tractor Air Conditioning Condenser

The tractor air conditioning condenser acts as a heat exchanger to lose heat from refrigerant to air passing over the condenser fins.

Many tractor manufacturers locate the air conditioning condenser in front of the radiator. Agricultural field operations create dust and chaff which can restrict airflow through condenser fins causing air conditioning reduced performance problems.

During tractor air conditioner operation, refrigerant gas at high pressure is pumped by the compressor into the condenser.
Refrigerant changes state from high temperature gas to hot liquid refrigerant during the condensation process losing heat to air via condenser fins.
Restricted air flow through the air conditioning condenser fins will reduce air conditioning system efficiency.
On some vehicle R134a systems refrigerant leakage from the condenser may be noticed by accumulation of a damp oily residue if refrigeration oil is lost.

Tractor air conditioning Thermostatic Expansion Valve TXV

The TXV acts as a metering valve fitted just before the evaporator.
Liquid refrigerant enters the TXV at high pressure and is metered into the evaporator where pressure and temperature changes occur.

A failing TXV may stick or become blocked by debris if the receiver dryer filter dessicant pack breaks up.
This will cause excessive system pressure, evaporator freezing, and likely overheating or failure of the compressor.
A sticking txv could cause liquid refrigerant to enter the compressor.

Tractor Air Conditioning Evaporator

The tractor air conditioning evaporator is the heat exchanger usually located in the roof space above the cab and will sometimes require cab roof removal to access.
Heat from cab air is removed as it is blown across the fins of the evaporator by cab blower fans.
Evaporator temperature is monitored by a thermostatic switch controlling compressor clutch operation to prevent refrigerant freezing.
Moisture and dust build up on the evaporator coils which may lead to a breeding ground for bacteria and unwanted smells.

Cab Filters - Tractor Cab Blower Fans

Air at ambient temperature is drawn in to the tractor cab through cab pollen filters by electric blower fans and moved across the evaporator where heat is removed from the air allowing a cool chilled airflow from cab vents. Tractor cabin air filters accumulate dust and should be checked periodically and replaced as necessary.

Tractor Air Conditioning System Receiver Dryer Filter - * Service Part *

The air con system receiver dryer filter functions to remove moisture from the ac system.
Replacement of receiver dryer filter should be carried out at manufacturers recommended service interval.
Renewal of the air conditioning receiver dryer is recommended following any maintenance operation involving disassembly of refrigerant circuit components.
for example, whenever a compressor, pipework, or aircon heat exchanger is replaced, or

Tractor receiver dryer typical part no. 5165615 (CNH)

Tractor Air Conditioner System Refrigerant Leak Tests

Refrigerant leak testing of tractor air conditioning system may be accomplished by different methods such as OFN pressure test, electronic refrigerant sniffer, Ultraviolet dye , or leak detection spray.:

OFN Pressure Test of Tractor AC Systems

A Nitrogen pressure test of the Aircon system should be carried out to check for leaks after repair work / fitting new tractor air conditioning system components before refrigerant is added.

An empty air conditioning system is pressurised with Nitrogen gas then locked off whilst under pressure,
Pressure loss will indicate presence of a leak which may be detected using leak detection spray.

Vacuum Decay Test

Following system evacuation, a vacuum decay hold test is advised prior to regas.
The air conditioning system is locked off whilst under Vacuum and monitored using vacuum guage for any rises in pressure indicating ingress of air.

UV Leak detection

Specialist ultraviolet dye is added to the air conditioning system, leakage can be detected by shining an ultraviolet light over suspect area.

Electronic Leak Detector

An electronic leak detector can be used to detect presence of refrigerant gas leaks.

Operational Checks

Tractor air conditioning operational checks of refrigerant pressures and vent temperature can be carried out after regas then final system leak checks.

Vehicle Make	CASE IH CATERPILLAR CLAAS DEUTZ FENDT FIAT FORD INTERNATIONAL HARVESTER JCB JOHN DEERE KRAMER KUBOTA LAMBORGHINI LOMBARDINI MASSEY FERGUSON NEW HOLLAND RENAULT AGRI SAME AGRI STEYR VALMET	Tractor Model
Engine CC
Year of Mfr		Reg no
Components Required	COMPRESSOR COMPRESSOR CLUTCH COMPRESSOR PULLEY COMPRESSOR SERVICE TOOLS
Your Name		Email address
Comments

We welcome tractor combine crop sprayer and telehandler air conditioning enquiries.