Tractor Hydraulic System Requirements

Operation of the hydraulically driven motors requires tractor to have either a load sensing hydraulic system or a closed center hydraulic system with flow control. These types of hydraulic systems usually have and do the following:

• Large oil reservoirs.
• Increased oil cooling capacity.
• Consistently deliver oil flow to maintain CCS fan speed at the selected RPMs without surging.

Tractors with open center hydraulic systems are not recommended for the following reasons:

• No means to control volume of oil flow.
• Excessive oil temperature.
• Decreased oil flow to fan motor during operation of other tractor control valves.
• Reduced oil flow to tractor power steering.

IMPORTANT: In addition to these requirements, tractor MUST be equipped with a low-pressure drain line connection for the fan motor case drain.

Sump pressure MUST be less than 172 kPa (1.72 bar) (25 psi), or fan motor damage occurs.

See your John Deere dealer for installation of a Low-Pressure Drain Line Kit, when tractor is not equipped.

NOTE: See Recommended Tractors and Tractor Hydraulic Compatibility for further information.

Make sure tractor hydraulic system meets all requirements.