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7305 - do I even need glow plugs

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sreebb
Join Date: Sep 2020
Posts: 3 SoCal
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2020-09-20          199713


A while ago I noticed that the glow plug light on the dash was staying lit in operation.

Today I thought I would fix it.

The first thing I discovered was that my shop manual doesn't have an electrical schematic as built.

No schematic specific to the 7305. The schematics I do have show the ignition switch directly switches voltage to the plugs.

I have always thought that there was a automatic timer and there is no switch position for "heat"

The parts diagrams shows a timer and relay.

Probing the plugs showed that they were getting continual power.

Measuring the resistance of the plugs show them to be high resistance. I assume they didn't live with continual power.

So I pulled the glow fuse and closed it up. Problem solved?

Or is there some reason I need glow plugs?

If I need them, I would be tempted to add a push button switch in place of the relay.


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7305 - do I even need glow plugs

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Murf
Join Date: Dec 1999
Posts: 7142 Toronto Area, Ontario, Canada
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2020-09-21          199714


Depending where you are in So. Cali you might not need them often, but likely you will need them.

The glow plug light staying on is a well known issue, it's the glow plug relay, it's not an expensive or difficult fix to swap out the relay. The problem is it usually means it's ebergized the glow plugs with the engine running and likely burnt them out by now.


Best of luck.


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7305 - do I even need glow plugs

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chashm
Join Date: Oct 2013
Posts: 65 United States
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2020-09-21          199715


If you want to start your tractor when the engine is below 50F, say, you need the glow plugs...

The electrical schematics are in the back of the service manual, see the link. You'll want to use the 727* entries for a 7305. The scan quality ain't great. And, interestingly, it doesn't show either the glow plug timer or relay. I suspect some SNs had a manual glow plug setting on the starter switch.

The Cub Cadet PN of the glow plug relay is MA-MM43128201. The glow plug timer is MA-MM436811. Glow plugs are original MA-MM431439 (all SNs), now subbed to MA-30H66-06100, although one site says this sub is for SN 23070 or later. The glow plugs are pretty cheap ($15), but a push-button to feed the relay may be better than the $100ish for the timer. ....


Link:   

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7305 - do I even need glow plugs

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sreebb
Join Date: Sep 2020
Posts: 3 SoCal
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2020-09-21          199716


Thanks for the link. Handy to have. As you noted, the schematic, like the one in my hard copy service manual, doesn't show the timer or relay.

I now suspect that my glow plugs were probably toast by the first time I noticed the light on unexpectedly so I may have been without functioning glow plugs for years.

Temperatures below 50 during the day are rare here. In a few months I will give it a try in the early morning.
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