New HMMWV M1097R1 Guy Has Questions

[BadAmish]

Hello,
We are proud to have just gotten our first HMMWV, which we got from GovPlanet. So many questions that we hope some of you can help us with.

There appears to be additional stuff that appears to be intercom or radio related.







Is any of this stuff useful for HAM/Amatuer radio?

Thank you

 

[juanprado]

The front trays are for radios and the top has a radio mount. Bottom right is a speaker.

Middle front is another speaker of a different kind.

Mount on rear tunnel looks like another radio mount.

Wires on rear fender, one is for an antenna.

All this stuff has little use in civy world. Some have rigged the speakers for other uses but they are not high fidelity by any means.

I would be interested in the u channel protecting the rear fender wires if you remove.

 

[juanprado]

One of the cables to the top front trays radio mount, I think is the power cable and probably still Hot and connected to power shunt.

I would remove.
Usually all this stuff is removed at demill before being sold.

 

[BadAmish]

I would be interested in the u channel protecting the rear fender wires if you remove.

@juanprado - Thank you for your replies. We are not planning to remove anything at this time, but honestly do not know since we only had the truck 2 days - so much to learn and decisions yet to make on how we want to setup and use this truck.

It starts up and runs but the steering is like wrestling a bear. It says power steering going out in felt pen on the windshield so I think that is priority one right now. I am preparing some photos with questions on HMMWV power steering now and will post soon.

 

[NDT]

Wow GP getting sloppy, usually every bit of radio stuff gets stripped out.
Power steering on these is a pain, you must follow the TM procedure to get the air out after repairs.

 

[BadAmish]

Looking at other HMMWVs on GovPlanet I see this big round thing:



This is our engine from above and we do not seem to have this part. Is it missing, or is our engine just different?

 

[juanprado]

Wow GP getting sloppy, usually every bit of radio stuff gets stripped out.
Power steering on these is a pain, you must follow the TM procedure to get the air out after repairs.

Yes, but weird things happen with them. A few millennia ago, a hmmwv with an antenna tuner still mounted on the rear right fender got sold to a member here. Not sure if it works but he sold it it to me with all the cables and mounts knowing I wanted it for a "display" and not to flip. I could never had afforded the thing otherwise.

 

[NDT]

Looking at other HMMWVs on GovPlanet I see this big round thing:

View attachment 952958

This is our engine from above and we do not seem to have this part. Is it missing, or is our engine just different?

View attachment 952959

Big round thing is power steering remote reservoir. You have V belts so you will have the old design GM pump with integral reservoir.

 

[TOBASH]

We are all happy to help.

FYI, Technical manuals (TM’s) are free and downloadable at the top stickies and also in the TM forum of the website.

That might help with some of your questions.

 

[BadAmish]

Big round thing is power steering remote reservoir. You have V belts so you will have the old design GM pump with integral reservoir.

@NDT - Thank you for the reply. In another forum post I read that the owner need a 1900 PSI power steering pump. Would my HMMWV need the same?

FYI, Technical manuals (TM’s) are free and downloadable at the top stickies and also in the TM forum of the website.

@TOBASH - Thank you. I have a M1097R1 and did not see my model listed. Is my HMMWV compatible with one or more of the other manuals, and if so which one(s)?

 

[TOBASH]

M1097 means your vehicle was rebuilt. Does not mean M1097 is a specific model. M1097 is a catch all poorly descriptive “bastardized” term that includes several iterations IIRC.

From the v-belts and three speed shifter you can start by looking up M998.

Your dual voltage alternator might be N3135.

Your transmission is a mechanical three speed automatic TH400 that will LACK a parking lockout.

Your engine appears to be normally aspirated (n/a). Most likely a 6.5, less likely a 6.2.

Your best source of information is RWH Retired War Horses. Former military mechanic and current civilian mechanic who works on many of these.

 

[BadAmish]

From the v-belts and three speed shifter you can start by looking up M998.

@TOBASH - Thank you. I will get the manuals and get reading.

Your best source of information is RWH Retired War Horses. Former military mechanic and current civilian mechanic who works on many of these.

I found their website. They are in California and I am in Oregon so I won't be visiting them for this. Maybe they have parts I need so if they ship I will see.

Seems this is a GM part power steering pump with different valving. Somewhere I read that the valving is done with bolts on the back of the pump and can change the PSI that way.

 

[juanprado]

Yes, it is a tradional Saginaw gm pump but pressure boosted up.
I would recommend the oe pump from a reputable military parts dealer. Many have tried using a gm pump and very unhappy.
Nothing oe gm has the hydraulic fan clutch, hydroboost, and possible hydraulic winch so you will not find the correct psi in oe gm.

 

[Coug]

M1097 is the heavy variant.

The R1 series designates this was part of a recapitalization program that upfitted lighter truck to the heavy variant.

If your truck has a 3 speed transmission use M1097A1 in the manuals.
If your truck has a 4 speed transmission use M1097A2 in the manuals.

Apparently if the truck is listed as 10k gross weight it may have the earlier (A1) halfshafts even if it is a 4 speed truck.
If it is 10.3k gross weight and 4 speed is should be almost entirely A2 comparable.

 

[TOBASH]

@TOBASH - Thank you. I will get the manuals and get reading.



I found their website. They are in California and I am in Oregon so I won't be visiting them for this. Maybe they have parts I need so if they ship I will see.

Seems this is a GM part power steering pump with different valving. Somewhere I read that the valving is done with bolts on the back of the pump and can change the PSI that way.

You misunderstood.

RWH is a prominent member on this forum as well as several HMMWV Facebook sites.

Read his posts and learn, and when he makes suggestions accept them and learn from them

 

[BadAmish]

UPDATE: I added some ATF fluid to the resevoir on the power steering pump a couple nights ago - made a bloody mess overfilling it - and I was able to turn the steering wheel left and right. It sure does make a lot of noise though. Does the howling indicate a power steering pump issue?

I was kind of expecting to see some leaks / drips of the ground the next day but did not find any. Two days later and the I can still turn the steering wheel, it's just howling a lot when I do it.

 

[KKroger]

UPDATE: I added some ATF fluid to the resevoir on the power steering pump a couple nights ago - made a bloody mess overfilling it - and I was able to turn the steering wheel left and right. It sure does make a lot of noise though. Does the howling indicate a power steering pump issue?

I was kind of expecting to see some leaks / drips of the ground the next day but did not find any. Two days later and the I can still turn the steering wheel, it's just howling a lot when I do it.

Probably air in the system... follow the procedure to bleed and purge air. Lot of hoses and such going on in that system with some trapped air.

 

[BadAmish]

Probably air in the system... follow the procedure to bleed and purge air. Lot of hoses and such going on in that system with some trapped air.

@KKroger - Thanks for the tip. The TM I have does not show the power steering pump I have. Our HMMWV is the one with the reservoir on the pump / pulley assembly.

 

[KKroger]

@KKroger - Thanks for the tip. The TM I have does not show the power steering pump I have. Our HMMWV is the one with the reservoir on the pump / pulley assembly.

Look in the A2 Manual... that is typically the PS setup for the A2 trucks R1s are kind of mixmasters.

 

[Mogman]

Probably air in the system... follow the procedure to bleed and purge air. Lot of hoses and such going on in that system with some trapped air.

Your R1 would be the same for the basic and A1 trucks if it has the reservoir on the pump as far as the steering goes.
If it has a 3 speed then it will just about be 100% the same as an M1097A1.