Cub Cadet 7260 Glow plug issue: Cub Cadet  -- Other Tractor Brands Discussion Forum and Review Cub Cadet 7260 Glow plug issue: Cub Cadet -- Other Tractor Brands Discussion Forum

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 01-15-2015, 17:48 Post: 191863
randyrandyt



Join Date: Jan 2015
Location: Riverview, Florida and Clarkesville, Georgia
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 Cub Cadet 7260 Glow plug issue

I have a 7260 with glow plug issues. I have changed the glow plugs and the relay, still no power to the glow plugs. I have checked the fuse box and I am getting 0 volts to the glow plug fuse. I have checked the backside of the fuse box where the power comes into that fuse and the wire looks fine. Where should the power to that fuse be coming from? My wire diagram shows wire from the switch going to the glow lamp and then to the glow plugs. It does not show anything about the relay or fuse box. So right now, when I turn the key to the first position, the glow lamp does not come on and no power at the fuse box where the glow lamp fuse is. Any help would be appreciated .






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 01-15-2015, 21:12 Post: 191865
chashm



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 Cub Cadet 7260 Glow plug issue

Hmm.
The operator's manual, parts manual and the service manual that I have don't really agree... I suspect Cub Cadet/MTD/Hitachi messed with the glow plug circuit over time.

The service manual schematic has the following current path for the glow plugs:
Battery --> Starter
Starter --> 'fusible link' (there is a 50A and a 60A fuse in a little plastic housing near the starter on the left side of the engine; these are NOT on the fuse panel)
fusible link --> ignition switch ('B' terminal) through a 2-wire connector probably behind the instrument panel
starter switch 'G2' terminal --> glow plugs through the other wire in the 2-wire connector above

The glow plug indicator light is connected between G2 and G1 on the ignition switch.

The legend for the fuse box on the schematic has a block labeled 'glow plug starter' but instead of a fuse size it says 'direct', implying perhaps this used to be a the function of this fuse position. 10 amps seems a bit low for the glow plug current draw.

No mention of a relay or controller for the glow plugs.

When you turn the ignition switch to 'heat', the B terminal is connected to G2 and AC (accessories, including the injector shutoff solenoid).
When you turn the ignition switch to 'start', the B terminal is connected only G2, ST (start) and AC.
When you turn the ignition switch to 'run', the B terminal is only connected to AC.
---------------
The Operator's manual has a 10A fuse in the fuse panel for 'glow plug indicator lamps', whatever they are.
--------------
The parts manual for a 7260 shows both a glow plug relay and a glow plug controller. Perhaps the controller has bit the dust?
--------------
Other than the glow plugs, do the electricals work fine? Engine turns over? Headlights work? etc.
Have you checked for voltage at the ignition switch? 'B' should be +12V all the time, G2 should be +12 for the glow cycle.
If the service manual schematic is correct, there is no separate time delay relay/controller for the glow plugs; this function is apparently built into the starter switch.
I don't see any words in the books about it, but I suspect that the glow plug panel light is a key part of the circuit; if the bulb is blown, the glow plugs will never warm up. So check the lamp too.






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 01-15-2015, 21:45 Post: 191866
randyrandyt



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 Cub Cadet 7260 Glow plug issue

Just prior to the glow plugs not working, the alternator lamp would flicker and sometime it would stay on a minute or two. That has not happened since the glow plugs quite working. The glow lamp does work, because it come on when I move the ignition switch to the start position. Everything else works fine. I appreciate the information. I will start at the battery , go to the starter and work back to the dash, checking the fuses and connections as I go. The service manual I have has two wire diagrams and both are absent of the info you gave me. I will try to find a parts manual and get the diagram from there. Again, Thank you.






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 01-16-2015, 22:09 Post: 191879
chashm



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 Cub Cadet 7260 Glow plug issue

Parts manual: I use partstree dot com (there are others but they seem to all share the same data) - you won't find a schematic but the parts diagrams will show you the various pieces, including the glow plug relay and controller for a 7260.

Alternator: Assuming you can get the engine running, is the alternator doing its thing? You should have a pretty constant 13.6V at the battery even when you turn the lights on an off (try it with the flashers; they're a pretty big drain when on).

Looking further in the parts book (I have a paper one as well), all the 7xxx (7260, 7305...) tractors have the glow plug relay and controller/timer listed. I bet the original design was the operator was to turn the switch to 'heat' for 3-5 seconds and then to start. People were burning out glow plugs by heating too long so they added the relay and controller/timer. Or maybe the contacts inside the ignition switch are underrated & the switch was burning out. Since I can hear the relay click when the light goes out, my guess is the timer & relay are behind the dash or kickpanel somewhere and wired to the G1 and G2 terminals on the ignition switch.

Once you find the controller/relay and one or the other is bad, you could rig the wiring back to the original, cutting out both the relay and the controller (thus risking the switch). If the controller is the problem, then you could rig the switch G1 & G2 directly to the relay coil, cutting out the controller. You'd have to remember to only heat the glow plugs for a few seconds, but if you're the only user, this shouldn't be a big deal. And you already have a set of probably perfectly good glow plugs should you burn one up.

It's too cold here to go take this apart on my tractor just for a look-see...






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Discussion Boards > Active Subjects > Messages as Posted > Cub Cadet Forum

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