Author Topic: International 20,000lb winch shear pin  (Read 11236 times)

Offline Mick_Marsh

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International 20,000lb winch shear pin
« Reply #15 on: October 08, 2012, 05:14:40 PM »
Many thanks to Jack, I now have a shear pin.
I've just dropped it off to a fellow in the next town. He reckons he can program it into his CNC and make a batch.
REMLR # 310, MVCA # 364, 101 Club # 2188, MHG #101
29-417 101 GS, 30-248 101 Rapier Tractor. 30-238 101
34-597 Crump & Cornish 1 ton Cargo Trailer
RT21 RAAF Track Tactical Trailer, 234-671 RAAF Track Tactical Trailer

Offline Mick_Marsh

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Re: International 20,000lb winch shear pin
« Reply #16 on: October 10, 2012, 08:09:38 PM »
An update:
The fellow I have dropped the shear pin off to reckons he can make them for $10 each. He will be making around sixty of them.
I have yet to price plating.
REMLR # 310, MVCA # 364, 101 Club # 2188, MHG #101
29-417 101 GS, 30-248 101 Rapier Tractor. 30-238 101
34-597 Crump & Cornish 1 ton Cargo Trailer
RT21 RAAF Track Tactical Trailer, 234-671 RAAF Track Tactical Trailer

Offline Mick_Marsh

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Re: International 20,000lb winch shear pin
« Reply #17 on: October 10, 2012, 09:43:52 PM »
Plated or unplated?
Do you think it's worth getting them plated?
I'll be plating mine.
REMLR # 310, MVCA # 364, 101 Club # 2188, MHG #101
29-417 101 GS, 30-248 101 Rapier Tractor. 30-238 101
34-597 Crump & Cornish 1 ton Cargo Trailer
RT21 RAAF Track Tactical Trailer, 234-671 RAAF Track Tactical Trailer

Offline Kaneya

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Re: International 20,000lb winch shear pin
« Reply #18 on: October 10, 2012, 09:55:27 PM »
Mick I will get three, just need account details to to lucky winner and I can transfer or use Paypal to an email addess if you prefer.

Cheers
Brad

Offline Mick_Marsh

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Re: International 20,000lb winch shear pin
« Reply #19 on: October 10, 2012, 10:12:50 PM »
Let's wait until they're done before we discuss payment and delivery.

Plated? Zinc? Unplated?
REMLR # 310, MVCA # 364, 101 Club # 2188, MHG #101
29-417 101 GS, 30-248 101 Rapier Tractor. 30-238 101
34-597 Crump & Cornish 1 ton Cargo Trailer
RT21 RAAF Track Tactical Trailer, 234-671 RAAF Track Tactical Trailer

Offline Mick_Marsh

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Re: International 20,000lb winch shear pin
« Reply #20 on: October 25, 2012, 06:39:44 PM »
Shear pins are made. I'll be picking them up tonight.
The next step is to get them plated. I'll be getting that done some time in the middle of next month.
REMLR # 310, MVCA # 364, 101 Club # 2188, MHG #101
29-417 101 GS, 30-248 101 Rapier Tractor. 30-238 101
34-597 Crump & Cornish 1 ton Cargo Trailer
RT21 RAAF Track Tactical Trailer, 234-671 RAAF Track Tactical Trailer

Offline Kaneya

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Re: International 20,000lb winch shear pin
« Reply #21 on: October 25, 2012, 07:50:50 PM »
Well done Mick, thank you very much for your efforts thus far.

Brad

Offline greg.p

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Re: International 20,000lb winch shear pin
« Reply #22 on: October 27, 2012, 10:32:57 AM »
Excellant Mick
I know this is a bit late, but my advice is to plate them.
Please PM me if you need funds to cover design, production costs etc.
You can put me down for 5 please.
Well done to everyone involved, this is what REMLR is all about - helping other people.
Cheers
Greg

Offline Bluebell One-eight

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Re: International 20,000lb winch shear pin
« Reply #23 on: February 08, 2013, 02:20:56 PM »
The change in the shear pin strength was brought about not by using different material, but by increasing the cross sectional area of the designed shear point. The "waist"was increased by approx. 1mm in diameter. The plating of the improved part was a brighter color (for identification), which is probably were the stainless steel furphy arose. See the photo (early type at the top)
    There should be a few checks done before using the winch. Check that the winch clutch actuator ram engages & disengages the clutch when the control lever is moved. This mechanism was notorious for seizing when not used for a while. It could be either the ram or the clutch lever assembly.The winch clutch must be engaged when the truck is travelling, because the drum brake is applied at the same time. If the clutch is disengaged the cable can unwind and cause an accident. If you find that the cable cannot be pulled out( by a couple of people) with the clutch lever in the disengaged position it's a sure indication of seizure as above  If a shear pin is fitted, remove it and check that the drive flange rotates freely on the input shaft. If not remove and clean up both the flange bore and shaft as required, and grease with anti seize(eg Moly GA50). I would recommend that the flange be removed and greased with an anti seize agent in any case as it will prevent any tendency to rust or seize. In the life of the truck the bore of the flange was increased by .003" to prevent seizure. The flange should be marked with the letter A to indicate this had been done, but this part was regarded as expendable and its possible that there are a few that haven't been. There were problems with the PTO self engaging in early times and if this happened at speed the driver could be unaware of it and the shear pin would fail, when the cable eye jammed in the fairlead assembly  the flange would rotate on the shaft and become hot enough to grab the shaft and massive chassis damage could result to the vehicle. The changes to the PTO lever detent mechanism largely eliminated this, but be aware of the possibility and avoid disappointment!
    The cable can now be unwound wear heavy leather type gloves to avoid being bitten by any "prickles" Check for damage, and replace the cable if needed. Lubricate the cable with an open gear lube this should be black in color.In service ZX8 was used. Check how much cable is on the drum for future reference. There should be 75 metres.wind the cable onto the drum with some tension on it. When there is just under a meter protruding (if the cable is at the front) stop winding. The cable eye is tied to the RH towing dee with some cord. This was supposed to give the drive some warning if the PTO engaged, but I cant remember a single case where it did that ( because of the lever mods) Some tied the cord to the brush guard but this could wreck it if PTO did engage. That's enough for now

Offline dkg001

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Re: International 20,000lb winch shear pin
« Reply #24 on: February 08, 2013, 07:50:43 PM »
Thanks Bluebell 101, great information on using these winches, like everything they seem simple in concept until you start using them.

Offline Mick_Marsh

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Re: International 20,000lb winch shear pin
« Reply #25 on: February 08, 2013, 10:36:25 PM »
OK.
I'm ready to distribute the shear pins.
They are $15each plus postage.

To get these shear pins, follow these steps:

1.  PM me how many pins you want, the name and the postal adress I am to send them to.

2.  I will reply with the amount to be paid including packaging and signed for postage. I will also include payment details in the reply.

3.  When I have confirmed payment has been made, I will post the shear pins.

I hope this is a simple enough process.
REMLR # 310, MVCA # 364, 101 Club # 2188, MHG #101
29-417 101 GS, 30-248 101 Rapier Tractor. 30-238 101
34-597 Crump & Cornish 1 ton Cargo Trailer
RT21 RAAF Track Tactical Trailer, 234-671 RAAF Track Tactical Trailer

Offline Mick_Marsh

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Re: International 20,000lb winch shear pin
« Reply #26 on: August 20, 2015, 12:45:36 PM »
Just thought I'd give this a bump.
REMLR # 310, MVCA # 364, 101 Club # 2188, MHG #101
29-417 101 GS, 30-248 101 Rapier Tractor. 30-238 101
34-597 Crump & Cornish 1 ton Cargo Trailer
RT21 RAAF Track Tactical Trailer, 234-671 RAAF Track Tactical Trailer

Offline john.k

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Re: International 20,000lb winch shear pin
« Reply #27 on: August 21, 2015, 06:21:00 PM »
The army turned more than a few trucks into banana shape by driving with the winch engaged.Probably the reason for chassis replacement.Usually the first the driver knew was a loud bang as the tailshaft broke at the slipyoke,due to being compressed into a shorter space.The 6x6 had a special setup that shut off the ignition.Regards John.

Offline GGG

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Re: International 20,000lb winch shear pin
« Reply #28 on: August 21, 2015, 07:11:26 PM »
The ignition cut out on the F1 took all the fun out of it. Who would not want to crawl under a truck in the mud to replace the shear pin ::)
Geoff.

Offline Bluebell One-eight

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Re: International 20,000lb winch shear pin
« Reply #29 on: August 21, 2015, 07:57:51 PM »
The army turned more than a few trucks into banana shape by driving with the winch engaged.Probably the reason for chassis replacement.Usually the first the driver knew was a loud bang as the tailshaft broke at the slipyoke,due to being compressed into a shorter space.The 6x6 had a special setup that shut off the ignition.Regards John.
The ignition cutout was actually used on MK2s, and the problem must have been evident on the prototype that had a winch fitted, because the Mk 2s were fitted with the heavier straight rail chassis like the Mk3s. The reason for such a small number of Mk 2s being made was probably because of the need to source a heavier chassis. The switch was a weak link because water, mud and dust rendered it useless with the stated result. The problem was the PTO had a habit of engaging itself while the truck was being driven. The shear pin would break but the drive flange would continue to turn and could eventually become hot enough to grab the shaft and drive the winch. The Mk5 set up would keep driving if the pto was engaged and the cutout switch was faulty. The weakest point would then become the "cutout "  The original lockout for the Mk3 was a flap that was hinged to the floor and flipped over to hold the lever forward. The flap would ride up the lever and then move over centre which would allow the PTO to engage. The Mk5s used a trigger with a rod attached which entered a detent hole. This arrangement was fitted to Mk3s as a mod. The rod could become bent and become ineffective so a further mod which consisted of a guide for the rod being welded to the lever. This fixed the fault. I suspect that a lot of incidents were the result of the PTO being left in the engaged position after winching.