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Tool Talk Discussion Forum

Stuck Lovejoy Coupler

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Dale in WV

05-23-2006 18:13:39

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Ok. Got a 5hp gas engine powering wood splitter. The seal around the output shaft is just starting to drip a few drops of oil. I have a replacement seal, but the blasted lovejoy coupler seems permanently bonded to the shaft. The set screw is out, I've soaked the coupler/shaft with PB Blaster. I've tried tapping with a brass hammer, followed that with a wheel puller with "some" pressure, not wanting to either blossom the end of the shaft or do damage to the coupler.
Any suggestions folks?

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Dale in WV

05-24-2006 02:22:52

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Re: Stuck Lovejoy Coupler in reply to Dale in WV, 05-23-2006 18:13:39

First of all, many thanks for the responses. You posed a couple questions
a) The Lovejoy looks like its cast iron to me. Its on a B&S engine for a 1993 vintage wood splitter that's seen a fair amount of homeowner use.
b) Only one set screw - I can see the top of the key in the keyway - though getting the original set screw out was a bear, too. Ended up using a drill and a bit used to remove damaged screws(?) As I was drilling it threaded back out, so I've no damage to the set screw threads.

I'll try applying some heat/pressure concurrently. I'll try a heat gun first -- I know its not optimal, but the complete engine is still mounted on the splitter. Complete engine means gas tank is still attached, six inches from the output shaft....

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JMS/MN

05-24-2006 06:32:54

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Re: Stuck Lovejoy Coupler in reply to Dale in WV, 05-24-2006 02:22:52

If you don't mind wassting the coupler half- cut it off with cutoff wheel or grinder- no danger of explosion with a torch. Heat gun will do nothing.

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Vern-MI

05-24-2006 03:45:47

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Re: Stuck Lovejoy Coupler in reply to Dale in WV, 05-24-2006 02:22:52

The heat gun won't heat it to a high enough temperature fast enough. You need either a rosebud or cutting torch head to get the coupling heated up fast. What you are trying to accomplish is to heat the coupling up faster than the motor output shaft. The resultant temperature difference will cause the coupling to expand faster than the shaft and allow it to break free. You must have the puller tension applied prior to heating it with the torch. You will hear it pop loose in about the first ten seconds as the heat is applied. Remove the gas tank before heating to eliminate the fumes from catching fire or exploding. Also make sure that all rust has been cleaned from the shaft surface that the coupling is going to slide over so it won't bind in the rust.

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Lazy Mechanic

05-23-2006 21:26:21

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Re: Stuck Lovejoy Coupler in reply to Dale in WV, 05-23-2006 18:13:39

Is the Lovejoy coupling cast-iron, sintered metal, or die cast?

There is a possibility it is stuck due to corrosion from dis-similar metals.

Often, if steady pressure from a puller doesn't work, sharp blows from an air hammer (if you have one) are more effective. .....Use a blunt punch in the air hammer against the end of the shaft, while pulling on the coupling with your hand. ....The punch should be smaller than the shat diameter, to prevent "mushrooming" the shaft.

By any chance is there another set-screw in the hole? ....It is common practice to use one set screw to lock a 2nd set-screw.

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Dale in WV

05-25-2006 02:46:25

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Re: Stuck Lovejoy Coupler in reply to Lazy Mechanic, 05-23-2006 21:26:21

Mr. Lazy Mechanic was RIGHT! After soaking it with the PB blaster, and putting a lotta pressure with the wheel puller, the Lovejoy coupling came off. Instead of a key in the keyway, I found yet another set screw! I sure couldn't see it from topside, but it was there!
Thanks for the advice and you were on target on that call.

dale

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bjb in Ne

05-23-2006 19:40:02

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Re: Stuck Lovejoy Coupler in reply to Dale in WV, 05-23-2006 18:13:39

When the puller has some tension in it give the puller bolt a few sharp blows, then check the tension again, if less re-tension it and repeat until it comes off

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NC Wayne

05-23-2006 18:23:47

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Re: Stuck Lovejoy Coupler in reply to Dale in WV, 05-23-2006 18:13:39

The type Lovejoy couplings I assume your talking about are fairely cheap and easy to obtain. Break out the torch and heat it while you put pressure on it with the puller. If it comes off fine, if not you've already got the torch out so removal ought to be a snap. Good luck.

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Russ from MN

05-23-2006 19:36:05

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Re: Stuck Lovejoy Coupler in reply to NC Wayne, 05-23-2006 18:23:47

Most Lovejoys I have used are cast iron so it won't burn but it should expand well with heat.

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