Chevrolet 1533X2 30-cwt trucks

[Colin Alford]

Power Tire Pump

The conclusions drawn above regarding the Power Tire Pump may be incorrect.

We know that the cabs were different between 1533X2 and 1543X2, but these two different MCP cabs were more similar to each other than they were to a CMP cab.

The description in Driver’s Handbook CC60L-HB1 includes “...is controlled by a lever located on the running board valance to the rear of the front mudguard...the dust cap located to the rear of the control lever...disengage the clutch and pull out on the lever” (see first two images for complete text).

The comparable description in Driver’s Handbook C60L-HB1 (a normal CMP) includes “... is controlled from within the cab...the dust cap from the hose connection at the left frame side rail...insert a screwdriver...turn the shaft counter-clockwise to engage the gears.” (See last two images for complete text and image).

Are there any clearer images of the left running board valance on 1533X2 where we might be able to make out the control lever (knob)?

[Colin Alford]

Like many of the Chev Parts Lists, CC60L-01 uses mostly generic diagrams which do not give an accurate visual representation of the specific parts for the vehicle.

The Driver’s Handbook series are well illustrated.

Again, acknowledging that only some images from CC60L-HB1 may give a reasonable representation regarding 1533X2, here are some images that may be beneficial.

[Colin Alford]

Here are a few more images from CC60L-HB1 that might be useful, and the last of my “blast of info” for tonight.

Regards,
Colin

[Colin Alford]

I have re-read the entire thread and note that the info on page 37 of Volume V of the Design Record has not been included.

I note the discrepancy between the 133” wheelbase that has been quoted a number of times and the Design Record entry of 134 1/2”.

I have also included an image of “Maximum Vehicle Speeds” from CC60L-HB1, as the question of speed has come up in relation to two-speed rear axles.

[Charlie Down]

Hi Colin
This is great, thank you for sharing this information.
Reference the PTO air pump controls, I have over 300 photos of 1533x2 trucks in LRDG service and I can confirm that I have yet to see a control lever by the air hose connector. All evidence points towards the control lever being in the floor, activated by a screw driver.

Great scan of the waterfall grill, is there any more information and/or diagrams of this area. I'm interested in the bumper brackets and support rods details.

Actually I'm interested in as much information as possible as the 1542/1543 parts books seem to be the only useable references specific for the 1533.

Your 1542/1543 parts books area little goldmine of information!

[David Herbert]

I note that in post #184 in the 'Description of body' it states that "STANDARD tool boxes are provided", which I take to mean that these are to some extent universal, which would fit in with the suggestion that they are the same as used on CMP C60L trucks made in an earlier post.

David

[Bob Carriere]

..... I could not find the ratio...it's just not there..... it shows the whole rear end as an assembly but no ratio given........ will dig deeper tonight.....

[Paul Singleton]

Originally Posted by Bob Carriere

..... I could not find the ratio...it's just not there..... it shows the whole rear end as an assembly but no ratio given........ will dig deeper tonight.....

Bob, does this help?

[Bob Carriere]

Thanks Paul

Does the book give any details as to the difference between the 9600 and 9600H series.......... The H being used by the HD MapleLeaf truck....

Book sure looks clean....don't you ever read it????

I scored a NOS 5.43 ring and pinion for the torque tube 1940 1 ton Chev I have...

Cheers

[Paul Singleton]

Here it is Bob.

[Bob Carriere]

So the GMC.... the real GMC with GMC engines (228 and 248) had a model H similar to but different than the BIG Maple LeaF..... anything to keep the dealers happy!!!!!

Cheers

[Bob Carriere]

I feel like we have beencovering the definition of "sunshine"........

The more you dig/read/find the more you confused you are like a google search find...

so the heading of this thread should be possibly/matbe/perhaps a "30424" which is there plain as sunshine in one publication but not listed in the major assembly book. Glad no one is taking offence at the various new info coming up.

So the question begs to be asked.....are all LRDG 2 speed axles......??? how do we tell them apart...... do we have an inside cab picture that shows an adadded lever on the tranny gear shift lever???

....and now I know where I canfind a 2 speed rear axle....... if the yeard has not rolled everything for crap.... Grant nugg nugg wink wink do you remember????..... I still have a piece of rusted flaked black paint under my RH knuckle.... if only the snow can melt....

Need to hunt for more 42 Chev, GM, GMC, Maple Leaf good sheet metal....

Now that everyone has their best bible open can you cross check somo thing for me........ Shock absorbers........

The CMP early models had small double action Delco..... same used on early 4x4 Dodge trucks.... the VC and WC series I beleive..... Now we know that shock absorbers on the rear axle was an option on civilian models....and civilain models tended to have single action shock absobers in front.

All CMP rear axle have the larger shcokabsorber and eventually all cab 13 had the larger shocks onthefront as well.

What was installed on the larger Chev and GMC........ I have a Chev (41/42?) rolling chassis that sports the small CMP shock absorbers and the infamous flat 1/4 in. steel plate frame reinforcement...... but no other identifying marks....... could that frame be X military???? it has the large ball bearing on the front axle........ what goes on a 304123.....

Cheers

[Tony Smith]

Originally Posted by Bob Carriere

I feel like we have been covering the definition of "sunshine"........

So the question begs to be asked.....are all LRDG 2 speed axles......??? how do we tell them apart...... do we have an inside cab picture that shows an added lever on the tranny gear shift lever???

Cheers

"Sunshine" is a difficult concept to explain to Canadians, many have never seen it!

The pic of the 1533X2 cab shows the 2 speed differential lever.

[Bob Carriere]

...... that's the lever...and in the right location.....

Need to get myself more parts vehicles....... one "wrocksul" coming up.... and maybe a frame mounted Spicer for 4 extra gears........

slowwwwwwww speed would be nice in a parade....... you release the clutch in low low low gear on Monday afternoon and start rolling by supper time.

Thanks Tony.

[Paul Singleton]

Originally Posted by Bob Carriere

So the GMC.... the real GMC with GMC engines (228 and 248) had a model H similar to but different than the BIG Maple LeaF..... anything to keep the dealers happy!!!!!

Cheers

Yes, the 9600H used a GMC 248. The smaller GMC trucks in Canada used a 224 inline six. The 224 was a 216 bored 1/16” to give the larger displacement so the GMC would have a different engine than the equivalent Chevrolet.

[Bob Carriere]

The PO of my C15a had a rebuilt 224 that bolted right up to the CMP bell housing.

So Paul in your GMC manuals any pictures of the double action shock absorbers as seen on CMP????

Cheers

[Paul Singleton]

Hi Bob, my manual doesn’t have pictures of the shock absorbers on the vehicle but does have a section on overhauling the double acting shocks.

[Bob Carriere]

I have never been able to take one apart with out destroying it. Heat to loosen up the lever usually kills the oil seal at the very least.

Mind you over the years, I have found that if they move and are refilled wiht oil they are good enough for a CMP...... drove mine for a while across the backfield without them and noticed no difference when I installed them.

do you have any tricks to dismantle a totally salt pickled shock absorber?Some guy (Hemmings) in the US rebuilds them with a $150 core charge + time + parts.

[Paul Singleton]

Originally Posted by Bob Carriere

The PO of my C15a had a rebuilt 224 that bolted right up to the CMP bell housing.

So Paul in your GMC manuals any pictures of the double action shock absorbers as seen on CMP????

Cheers

Hi Bob, there may be some confusion about Canadian GMC engines. The U.S. GMC trucks used the 228, 248, 270 series GMC built engines. The Canadian trucks used a bored out 216 that displaced 224 cubic inches, only the heavy duty trucks used the GMC engines.

[Charlie Down]

Originally Posted by Andrew H.

Charlie, by "radiused curve" do you mean curved throughout? If so, that cannot be right, as the wartime photos show the 1533X2 bumpers to be straight, with a angled bends at each end.

Hi Andrew,
For years I thought that they only fitted curved bumpers, then as I got more involved in the research I kept hearing about angular bumpers. I checked my photographs and I'm confident that both were fitted. Its hard to get the right angles, and most photographs look like one version or the other, but its not always 100% clear. However the attached clearly shows a curved bumper and an angular bumper fitted to LRDG 1533x2 trucks. Both seem common and as its hard to distinguish which type it is in each photo its hard to say which one was most frequently fitted.

[Andrew H.]

OK I stand corrected. However I have to say that I have never before seen one with a curved bumper.

[David Dunlop]

Charlie.

In that left photo with the curved bumper, is the brush guard tube directly above it also curved to match the bumper, or is that just the shadows playing tricks on my eyes?

David

[David Herbert]

I think that both those trucks have curved brush guard tubes but possibly the one with the curved bumper is more curved.

David

[Charlie Down]

I think that the top tubes of the bush guard are both curved, even though the angular bumper version has the bush bar mounted on the central straight section of the bumper. I've checked my references and it looks like the vast majority that I can see from the right angle to discern their shape are curved. There's a couple that look straight, but could just be the angle. Some have rotated so the curve is in the vertical plain, not horizontal. Also found a couple that have no bush guard fitted at all, which I haven't noticed before. I've learnt the hard way with these trucks not to draw definite conclusions, so I'm comfortable to say that the vast majority are curved and there could be some that are straight!

[David Dunlop]

Maybe the curve was introduced so that when you crested a dune at speed and encountered a camel, it would be deflected to either side, rather than coming straight up over the bonnet and into the back of the truck.

David

[Charlie Down]

The first photo shows a Y Patrol truck without a bush guard and the 2nd photo shows the bush guard top tube rotated, showing the curve in the tube. Interestingly all the rotated tubes show the curve going up not down. I have no idea if that is significant.

[Charlie Down]

Dave Ashby has very kindly photographed and measured the bumper brackets on his 1542 truck which are the same on the 1533X2. He has asked me to post them for him. There are 6 photos and 1 drawing with dimensions attached here and on the post below. Note on photo 4 and 5 there is a smaller near vertical rod that attaches to and supports the bottom of the grill.

Thank you Dave for providing the photographs.

Colin Alford, I'd be really interested to see if there is anything on these brackets in your manuals, and also anything about the steering gear for the 1533X2 and 1542/3 trucks in your Major Assemblies Catalogue. The last pieces of information needed for a complete overview of the iconic LRDG 1533X2 truck.

Charlie

[Charlie Down]

Last photo and dimensions.

[Colin Alford]

Please see these extreme close-ups of the transmission-driven tire pump control lever and hose connection point on the left running board of the 1543X2 and the 1533X2.

[Charlie Down]

Colin,
That's fantastic!
Never thought I'd see this in such detail. This looks like there was no hole in the cab floor to activate/control the PTO pump, just this simple pullout lever to engage it. Or maybe both?
The question remains for me, what other details have you got of this series of trucks.
I posted photos of the 1542/3 bumper brackets kindly provided by Dave Ashby, which shows a modified grill where the bumper brackets come out the front panel. The modification gives a larger opening for the military style bumper I presume. Really keen to see any details of this if you have them. I've checked my LRDG 1533X2 photo's but can't see whether this detail is on the trucks, its just an area that was hidden by the bumper or stowage. Any help massively appreciated.