Pump clutch is stuck

[Bryce C]

I replaced my pressure pump yesterday. My goodness that thing was ancient and had so much rust and shmegma on the bottom side from small unaddressed leaks it was ridiculous. I was able to salvage the mounting plate with a little dremeling.

Now my pump clutch is seized, or stuck in the engaged mode so the pressure pump just stays on whenever the tm is running. It worked fine before. It took a lot of force with my gear puller to remove the pulley from the old pump. I released the 2 allen set screws first, but damn that thing was on there. After installing it I blasted the face of it with wd 40 and let it sit overnight, still stuck this morning. Anything that can be done to set it free? Could it be a shot bearing, or? A new one is $350. Should I just get a new pump clutch?

 

[Dwain Ray]

I replaced my pressure pump yesterday. My goodness that thing was ancient and had so much rust and shmegma on the bottom side from small unaddressed leaks it was ridiculous. I was able to salvage the mounting plate with a little dremeling.

Now my pump clutch is seized, or stuck in the engaged mode so the pressure pump just stays on whenever the tm is running. It worked fine before. It took a lot of force with my gear puller to remove the pulley from the old pump. I released the 2 allen set screws first, but damn that thing was on there. After installing it I blasted the face of it with wd 40 and let it sit overnight, still stuck this morning. Anything that can be done to set it free? Could it be a shot bearing, or? A new one is $350. Should I just get a new pump clutch?

My guess is that you damaged it when you used a puller to remove clutch and pulled it from the rotor/pulley )outer part where the belt goes) which inturn pulled against the armature/ hub assembly (clutch plate which was stuck on th pump shaft )instead of using a bolt . If im correct ,time for a new clutch . After watching a YouTube video on removel of your clutch there using a puller but if its stuck on like yours putting alot of force on the rotor (belt part) to pull the hub (center) off the shaft probably damaged the armature and or the center bearing. Although what you might try doing lis try to push it back out eighter hooking the puller up and pushing on the back to push the armature off the rotor or if it mounted to the pump lightly ( i did say lightly l tap on the pulley to free it from the armature but be mindful and careful not to damage your new pump if you can get the armature and pully to spinn free you may have saved it

 

[Bryce C]

My guess is that you damaged it when you used a puller to remove clutch and pulled it from the rotor/pulley )outer part where the belt goes) which inturn pulled against the armature/ hub assembly (clutch plate which was stuck on th pump shaft )instead of using a bolt . If im correct ,time for a new clutch . After watching a YouTube video on removel of your clutch there using a puller but if its stuck on like yours putting alot of force on the rotor (belt part) to pull the hub (center) off the shaft probably damaged the armature and or the center bearing. Although what you might try doing lis try to push it back out eighter hooking the puller up and pushing on the back to push the armature off the rotor or if it mounted to the pump lightly ( i did say lightly l tap on the pulley to free it from the armature but be mindful and careful not to damage your new pump if you can get the armature and pully to spinn free you may have saved it

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A more experienced mechanic would probably be able to remove an old seized pulley/clutch without damaging it eh. What's a guy do in the future to prevent damage? Go back and forth heating and lubricating it while slowly putting more pressure on the gear puller?

I'll play with the existing clutch and pump lightly to see if l can free it up. I suppose I can run this thing like this with the pump stuck engaged for a while...

 

[Dwain Ray]

A more experienced mechanic would probably be able to remove an old seized pulley/clutch without damaging it eh. What's a guy do in the future to prevent damage? Go back and forth heating and lubricating it while slowly putting more pressure on the gear puller?

I'll play with the existing clutch and pump lightly to see if l can free it up. I suppose I can run this thing like this with the pump stuck engaged for a while...

What it sounds like your problem is is the rotor is pulled up tight against the armature. And is acting like the clutch is engaged you eighter have to go from the magnet side and push the armature out(away from rotor/ pulley) or with the armature held in place knock the rotor/pulley away from the armature if you run it for any length of time the way it is if it starts slipping it WILL generate alot of heat and perhaps even sparks the only way you can safely leave it is to convert the clutch to a pulley by drilling 1 or 2 holes thru the armature and rotor/ pulley tapping the hole in the pulley and inserting a bolt or to to make the 2 pieces 1 permanently. I drilled and tapped the clutch o my old machine and carry a ¼ -28 bolt in my glove box because ive had problems with the magnet in the past. And it left me dead in tje water( 2 hours from my shop of course)So if the clutch magnet goes out again all i have to do is align the holes and install the bolt and back in business. O ya make sure the bolt is short enough that it doesn't come in contact with the magnet (when tightened it doesn't stick out the backside)

 

[Bryce C]

What it sounds like your problem is is the rotor is pulled up tight against the armature. And is acting like the clutch is engaged you eighter have to go from the magnet side and push the armature out(away from rotor/ pulley) or with the armature held in place knock the rotor/pulley away from the armature if you run it for any length of time the way it is if it starts slipping it WILL generate alot of heat and perhaps even sparks the only way you can safely leave it is to convert the clutch to a pulley by drilling 1 or 2 holes thru the armature and rotor/ pulley tapping the hole in the pulley and inserting a bolt or to to make the 2 pieces 1 permanently. I drilled and tapped the clutch o my old machine and carry a ¼ -28 bolt in my glove box because ive had problems with the magnet in the past. And it left me dead in tje water( 2 hours from my shop of course)So if the clutch magnet goes out again all i have to do is align the holes and install the bolt and back in business. O ya make sure the bolt is short enough that it doesn't come in contact with the magnet (when tightened it doesn't stick out the backside)

Oh snap, thanks Dwain!

 

[Dwain Ray]

Oh snap, thanks Dwain!

I hope that wasn't too complicated or confusing and that makes sense to you,

 

[Bryce C]

I hope that wasn't too complicated or confusing and that makes sense to you,

Nope I get it. So glad I said something, I was thinking about leaving it until next spring! Yikes! I think I'll just buy a new pump clutch and save the old one to tap as a backup for later. I've never tapped anything before, maybe I should learn and save myself a lot of money on the new clutch...

 

[Dwain Ray]

Nope I get it. So glad I said something, I was thinking about leaving it until next spring! Yikes! I think I'll just buy a new pump clutch and save the old one to tap as a backup for later. I've never tapped anything before, maybe I should learn and save myself a lot of money on the new clutch...

Tapping is easy you drill the proper size hole (generally drill size is marked on tap)then insert tap and with a few drops of cutting or light machine oil tighten like it is a bolt but for every 1-2 turns back it out ¼turn to breakup the chips and thats all there is to it

 

[Bryce C]

Wow I'm in! When I thread a short bolt into the pulley, will any bit of the bolt being proud of the inside of the pulley end up hitting the magnet? Should I just thread the bolt enough to bite the pulley and stop, or can it go through it by 1mm or so?

 

[Dwain Ray]

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Nope I get it. So glad I said something, I was thinking about leaving it until next spring! Yikes! I think I'll just buy a new pump clutch and save the old one to tap as a backup for later. I've never tapped anything before, maybe I should learn and save myself a lot of money on the new clutch...

ill look tomorrow i may have a used but good pump clutch laying around. I know I have several driveshaft clutches on the shelf but not sure about the pumps i know i have old style got one of them this weekend on the pump i salvaged off thet machine i wrote about parting out but the old style wont fit your machine

 

[Dwain Ray]

Wow I'm in! When I thread a short bolt into the pulley, will any bit of the bolt being proud of the inside of the pulley end up hitting the magnet? Should I just thread the bolt enough to bite the pulley and stop, or can it go through it by 1mm or so?

You drill the hole just below the v belt groove and above the hollowed back where the magnet rides. where the metal is thickest i can't remember but i think my bolt is eighter ½or ¾inch long it might even be an inch long

 

[Dwain Ray]

Another way to go is buy a pulley same diameter as clutch with same size keyed hole as pump shaft and remove clutch magnet and align and tighten set screws and be done with it

 

[Bryce C]

Thanks Dwain. For the tips and for looking into some old parts for me. I'll get a tap and a short bolt and make my stuck clutch more stuck soon!

 

[Bryce C]

Another way to go is buy a pulley same diameter as clutch with same size keyed hole as pump shaft and remove clutch magnet and align and tighten set screws and be done with it

That's brilliant! I may go this route also.

 

[Dwain Ray]

Thanks Dwain. For the tips and for looking into some old parts for me. I'll get a tap and a short bolt and make my stuck clutch more stuck soon!

Turns out i have at least 2 pump clutches they each are configured double A belt and fit a ¾" straight keyed shaft. Haven't measured diameter both are currently mounted on hypro 2340bp pumps if your interested in one make sure shaft size is correct and let me know the diameter of your pulley and we'll go from there. These are my personal spare parts and not "free to good home". However if you want one im willing to part with it. I will test/pull/&ship when you receive it drop a check in the mail for what it's worth to you that'll be the price

 

[Dwain Ray]

Thanks Dwain. For the tips and for looking into some old parts for me. I'll get a tap and a short bolt and make my stuck clutch more stuck soon!

Im sorry, the clutch i drilled out and tapped is an old style obsolete clutch and has alot of space to bolt looks like the only way to do it on a modern style clutch is to remove the magnet and drill and tap inside the 6 grooves and use 8/32 machine screws. I did this 15 years or so ago memory's not what it used to be but with the magnet removed it shouldn't be necessary to tap just run a machine screw thru and put a nylon lock nut on the other end itll spin in the place once occupied with magnet