2640 Dash Light

coxwk · Apr 18, 2015

I just bought a 1978 2640 that came with the owner's manual and a shop manual. On the right side of the dash above the throttle lever is a nickel sized red light. It comes on when I start the tractor and then goes out as the engine gets to speed. I checked both the manuals I have and neither shows the light as part of the instrument panel.

My question is, is the light for the alternator or is it an oil pressure light?

Tx Jim · Apr 18, 2015

I think the RH warning light is oil pressure. Lens should a symbol resembling a drop of oil or if alternator a lightening bolt.

buickanddeere · Apr 18, 2015

Parts book should show that somewhere? http://jdpc.deere.com/jdpc/servlet/com.deere.u90490.partscatalog.view.servlets.HomePageServlet_Alt Main wiring harness is one spot to start.
An early or late 2640? During mid production manufacturing was moved to Mannheim.
Measuring system electrical voltage at various rpms and with the head lights on will indicate possible problems.
The alternator pulley,fan pulley and fan belts are often worn. Over tightening enough to prevent slippage on worn pulleys will ruin the alternator and water pump bearings.
A real mechanical oil pressure gauge would verify oil pressure? Is there lightweight winter oil in the crankcase that has been diluted even thinner by hard winter starting?

Steve in IL · Apr 18, 2015

Can you trace the wire? My 2240 has great access to the back of the instrument panel through the battery box.

Tx Jim · Apr 18, 2015

(quoted from post at 12:51:47 04/18/15)

An early or late 2640? During mid production manufacturing was moved to Mannheim.

I'm sorry to correct you but 2640's were never built in Mannheim only built in Dubuque,Ia. 1coxwk's 1978 2640 would be classified as an early model

2640 Dash Light

coxwk

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Tx Jim

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buickanddeere

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Steve in IL

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Tx Jim

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