DK-40 Backhoe boom lock won't lock, (2485)!!

Coyote machine · Jan 20, 2012

Went to lock the boom after working the hoe hard and found that no matter what I did I could not get the boom lock to lock onto its pins. Note that I had a while back put some grease on the locking mechanism to get it to move toward lock position without having to lift up the spring bar. The spring bar had been keeping it from moving to lock position by using the lever handle; which as I understood it is what one is supposed to do to engage the lock onto the pins. Today and other recent times the lock assy has gone from not wanting to move without releasing the spring with my other hand to the lock ears dropping down to lock position while operating the hoe vigorously. I noticed today when I was trying to bring the boom back to near upright I couldn't, and looked down to see the lock mechanism in the way of retracting the boom. Long story short, I think I bent the ears with pressure from the boom trying to go to upright position and I haven't been able to figure out how to get them back into proper position! I've tried a prybar- no go. I tried a chain from the ears to the bucket and curling the bucket- no go.
Only thing I can think of now is to cut the ears to fit the pins, but obviously I'd rather avoid that route if at all possible. Anyone else run into this dilemma? If so any ideas on how to fix?

TIA for ideas!:thumbsup:

Coyote machine · Jan 21, 2012

Looks like I'll have to answer my own thread?!:confused2:
Went to my dealer today and measured from the pin of the lock mechanism to the inside edge of the lock bar's ears and found that mine are pushed back toward the mainframe 1/2 inch. This is the reason I can't close the lockbar into the lock position. So I'm going to remove the lockbar and beat it senseless on a huge anvil a friend has nearby, that I can use next week.
If that doesn't work, then I may try to cut the lock ears back enough to free up 1/2 inch that is needed for the lockbar to work.
Anyone who feels like throwing in some ideas please feel free to do so.
:thumbsup:

Lloyd_E · Jan 23, 2012

Have the same problem...

I will heat and re-bend into position. I put the lock into position and marked with a sharpie the correct position with the tab/BH frame. Find a piece of pipe the same diameter as the tab and use this to mould the tip around.

Good luck...

Coyote machine · Jan 23, 2012

Lloyd_E said:
Have the same problem...

I will heat and re-bend into position. I put the lock into position and marked with a sharpie the correct position with the tab/BH frame. Find a piece of pipe the same diameter as the tab and use this to mould the tip around.

Good luck...

Hi Lloyd,
Glad to hear I'm not the only one out there who has bent the c@3p out of the locking ears!
I took the whole thing to my local welder today and he heated up the ears and then banged them back to the proper shape for reasonable $.
I got a printout of the part page from my dealer so I could mark out the dimensions needed for the welder, since I only brought him the mechanism and not the tractor/hoe. I told him to go from the backside of the pin which holds the mechanism on the mainframe to 8.5" to the inside of the hook on the ear. It worked perfect, partly because when I was at my dealer's pricing out a new mechanism, I took time to measure the dimensions on a hoe on the lot.:thumbsup:

How'd you bend yours?

Thanks,

CM

rimshot · Jan 23, 2012

I have a CK20 with a KB2465 backhoe. Once or twice I have failed to lock the boom latch in the up position and banged it with the boom. I was lucky because it did tighten the mechanism up a bit but still worked.

Now that I've been through that drill maybe I should tackle my next biggest user error...........unlocking the emergency brake before driving off in low.

Everything manages to work just fine every time but the operator.

rim

Coyote machine · Jan 23, 2012

FWIW, I lock my E brake solid enough that I can't really take off without releasing it or the brakes will protest loudly.:thumbsup:

Lloyd_E · Jan 24, 2012

Coyote...

I didn't fix it... yet! But I will take it off, place the ears in my propane forge, heat and bend/bang back into shape using a pipe with the proper OD to set the curve in the ears.

Lloyd

Coyote machine · Jan 24, 2012

Lloyd_E said:
Coyote...

I didn't fix it... yet! But I will take it off, place the ears in my propane forge, heat and bend/bang back into shape using a pipe with the proper OD to set the curve in the ears.

Lloyd

Lloyd,

I was asking how you damaged it to begin with?

Did your lock drop and then you raised the boom to bend it out of shape or was it something more spectacular?:laughing: