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Grn rider, Technician
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1979 JD 4640 WITH POWER SHIFT OVERALL RELIABILITY. TRANSMISSION,

Resolved Question:

1979 JD 4640 WITH POWER SHIFT OVERALL RELIABILITY. TRANSMISSION, ENGINE, HYDRAULIC PROBLEMS THE GOOD THE BAD ECT?
Submitted: 4 years ago.
Category: Small Engine
Expert:  Grn rider replied 4 years ago.

Hello, JD 4640, if you are looking at purchasing this tractor I would request complete hydraulic system evaluation, plugged sump screen or failed transmission pump/low pressure at one point can cause serious damage in these tractors. If every thing checks good then wouldn't have issue purchasing.

Good points, has 466 engine,very reliable. good power

transmissions are simple and reliable,if it was maintained properly.

 

Bad points, 8 speed transmission,very aggressive shifts

small cabs, when compared to newer tractors.

closed center constant high pressure hydraulic system, just creates more heat and wear on components,verses newer tractors with pressure on demand systems.

 

Over all, thumbs up good machine.

Grn rider, Technician
Category: Small Engine
Satisfied Customers: 282
Experience: 12+Yrs experience trouble shooting and repairs
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Grn rider
Grn rider
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12+Yrs experience trouble shooting and repairs