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Armor/AFV
For all military ground-force modelling subjects.
My first HEMTT - the Italeri LHS
AmTrac1833
#431
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Posted: Friday, August 19, 2016 - 07:37 AM UTC

Quoted Text

The find is fantastic, good job! - I wish we could find more items for sale like that with all that photo documentation!

However what you found this time is a Marine unit which differs greatly from the standard HEMTT. While all wheels are powered, steering is accomplished differently as the vehicle is hinged in the middle to steer like a big front-end loader. The really unusual thing about these trucks is you can "unhitch" the rear portion and drive the cab around like a conventual vehicle.

You can literally change the physical make-up of the vehicle to fit the mission at hand.

So quite different mechanically from thr standard HEMTT.



That is bad news for me. I want to do an LVS, need one to sit with my AAVs. I remember them being horrible rides, going cross country in 29 Palms I think I bounced my grape off the roof I don't know how many times. Springy freak'n seats.
Do you think it would be a horrendous challenge to take one of these HEMTT and convert it to an LVS Mk48? Your doing some incredible work with yours, my skill level is several notches below yours - and that may be a slight inflation of my skills.
165thspc
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Posted: Friday, August 19, 2016 - 06:16 AM UTC
The find is fantastic, good job! - I wish we could find more items for sale like that with all that photo documentation!

However what you found this time is a Marine unit which differs greatly from the standard HEMTT. While all wheels are powered, steering is accomplished differently as the vehicle is hinged in the middle to steer like a big front-end loader. The really unusual thing about these trucks is you can "unhitch" the rear portion and drive the cab around like a conventual vehicle.

You can literally change the physical make-up of the vehicle to fit the mission at hand.

So quite different mechanically from thr standard HEMTT.
AmTrac1833
#431
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Posted: Friday, August 19, 2016 - 05:28 AM UTC
Here's your opportunity for the ultimate reference for the build.

Seriously, was window shopping on eBay and this listing has some good images for details

http://www.ebay.com/itm/Oshkosh-MK48-LVS-8x8-Military-USMC-/172309857092?forcerrptr=true&hash=item281e77c344:g:xiQAAOSwdzVXta7J&item=172309857092
Stickframe
#362
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Posted: Friday, August 19, 2016 - 04:19 AM UTC
Hi Mike, great build as always! I and evidently lots of others are enjoying the step by step! Good work

Cheers
Nick
165thspc
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Posted: Friday, August 19, 2016 - 04:02 AM UTC
Someone said they really wanted to see this engine painted. Well I hope this meets with your approval. Base painting plus lite desert usage.



165thspc
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Posted: Friday, August 19, 2016 - 02:24 AM UTC
Thanks guys for the comments and compliments. It has crossed my mind more than a few times that maybe I am beating this horse to death but I do hope everyone's getting something good out of all this.

I know I am enjoying the build, I hope you are too!
Bigred69
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Posted: Friday, August 19, 2016 - 01:10 AM UTC
Hi Mike, I an going to fill this build away for future reference, when I put my HEMMT together. Thanks for all the information you have put out.
Ronnie
Taylornic
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Posted: Thursday, August 18, 2016 - 11:05 PM UTC
Good work!
165thspc
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Posted: Thursday, August 18, 2016 - 10:08 PM UTC


Going to have to lengthen those top radiator hoses just a bit. I have already lengthened the exhaust pipe coming out of the turbo before it gets to the muffler.
165thspc
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Posted: Thursday, August 18, 2016 - 09:43 PM UTC


165thspc
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Posted: Thursday, August 18, 2016 - 08:29 PM UTC


I finally went with cutting both the air compressor and the hydraulic pump in half. I think they look much more correct now.

Also I thought I would take a picture of that very nicely etched engine fan because once the radiator is installed we will probably never see it again.
165thspc
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Posted: Thursday, August 18, 2016 - 08:27 PM UTC
For the sake of full disclosure I did want to add that I had to modify the main front frame H-member I beam to achieve the angle and height I wanted on the engine.

165thspc
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Posted: Thursday, August 18, 2016 - 08:18 PM UTC
165thspc
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Posted: Thursday, August 18, 2016 - 07:35 AM UTC
Typical Hydraulic Pump:



What you are looking at is only about seven inches tall but can put out enough force to run the recovery winch or the LHS equipment!
165thspc
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Posted: Thursday, August 18, 2016 - 07:23 AM UTC
Starter Assembly:

165thspc
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Posted: Thursday, August 18, 2016 - 07:08 AM UTC
Partial exploded drawing of HEMTT air compressor.



165thspc
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Posted: Thursday, August 18, 2016 - 06:50 AM UTC
Typical standard HEMTT transmission:






Must be a rebuild. (Photo by BlackManistan)
Taylornic
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Posted: Thursday, August 18, 2016 - 06:26 AM UTC
I agree on the compressor and the p/s pump 100 percent. As for the tranny, I am not saying its wrong because I honestly dont have experience with it.

It seems the Hemtt had 2, possibly 3 trannies during the upgrades. It just seems to me that the Trumpeter trans looks much closer to the photos I have seen on the net associated with the earlier Hemtt.
165thspc
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Posted: Thursday, August 18, 2016 - 06:18 AM UTC
Taylor, my thought exactly - cut the compressor in half and make it look normal!

Also the other mystery device looks like two hydraulic pumps connected end to end. I was thinking of cutting that in half also.


Again I cannot figure out just what is going on with all that extra mechanism on the tranny. It looks great but it looks wrong.
Taylornic
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Posted: Thursday, August 18, 2016 - 06:09 AM UTC
Never saw a compressor like that. Looks like it should be cut in half before you install it. That mystery devise is a mystery. Lol

All I have ever seen is a simple twin cylinder compressor bolted to the back of the accessory drive.

I cant help with the tranny question, sorry. But, for the earlier Hemtt it kinda looks like the Trumpeter tranny looks more right.
165thspc
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Posted: Thursday, August 18, 2016 - 05:38 AM UTC

4 cylinder air compressor (I think) . . . . . . . . . . . . Mystery device


This is how they want you to put them together.


And they tell you to put them here.

Also; what is all that stuff on the transmission? Never saw anything like that but if I had to guess it is either some sort of cooler or an electrical generator????

I think now that maybe the person who originally mastered this engine model was not looking at a HEMTT reference, they were looking at a gen-set reference. An emergency back-up electrical generator set that happen to use the same engine as the HEMTT.
M4A1Sherman
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Posted: Thursday, August 18, 2016 - 04:42 AM UTC

Quoted Text

OK, another "accessory gearbox" question. I am guessing the following is a mistake on Real Model's part but I need to check with you guys. RM mounts the air compressor on the right rear corner of that gearbox which is OK but it is a DOUBLE compressor - it has FOUR cylinders!

It is clearly supposed to be two compressors on a common shaft. So, was there ever a HEMTT that either needed a high enough volume of brake air to need two air compressors or a HEMTT that needed a higher psi so they would run two compressors in a two stage arrangement to produce a higher output air pressure?



Hi, Mike!

Been following your build- GREAT STUFF! Someday, I'll get the chance to build my HEMTT Fuel Tanker! I bought it about 10 years ago, but have been too busy with other stuff...
Taylornic
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Posted: Thursday, August 18, 2016 - 04:16 AM UTC

Quoted Text

OK, another "accessory gearbox" question. I am guessing the following is a mistake on Real Model's part but I need to check with you guys. RM mounts the air compressor on the right rear corner of that gearbox which is OK but it is a DOUBLE compressor - it has FOUR cylinders!

It is clearly supposed to be two compressors on a common shaft. So, was there ever a HEMTT that either needed a high enough volume of brake air to need two air compressors or a HEMTT that needed a higher psi so they would run two compressors in a two stage arrangement to produce a higher output air pressure?



Can you post a photo of the part? I have never seen what it seems you are describing. My experience is from the OTR trucks I drove in the past with the 6v and 8v92 engines only.
165thspc
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Posted: Thursday, August 18, 2016 - 03:05 AM UTC
OK, another "accessory gearbox" question. I am guessing the following is a mistake on Real Model's part but I need to check with you guys. RM mounts the air compressor on the right rear corner of that gearbox which is OK but it is a DOUBLE compressor - it has FOUR cylinders!

It is clearly supposed to be two compressors on a common shaft. So, was there ever a HEMTT that either needed a high enough volume of brake air to need two air compressors or a HEMTT that needed a higher psi so they would run two compressors in a two stage arrangement to produce a higher output air pressure?
165thspc
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Posted: Thursday, August 18, 2016 - 02:42 AM UTC
Keith, I don't mind you posting your work on the cab, not one bit. First of all the more the merrier! Second, I ordered an etch cabin detail set myself and having seen your advance information on your build will help me (I hope) to do a better job building mine.