Chevrolet 1533X2 30-cwt trucks

[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.

[Colin Alford]

Charlie,

The parts lists have very few useful diagrams in them. Most of the diagrams are generic and in many cases they illustrate parts for completely different vehicles. The best (worst?) example is the fuel system. The illustration is actually for the CMPs and is absolutely incorrect for the MCP trucks. The only useful purpose these illustrations serve is to provide Group Numbers to find the correct part numbers in the manual.

Unfortunately there are no diagrams of the bumpers or grilles. While the majority of the Grille is the same between 1542X3 and 1543X2, the Shell Assembly - radiator lower, is different, which is likely to accommodate the raised bumper on the 1543X2.

[Colin Alford]

In my spare time for the last couple of weeks, I have been attempting to understand the differences in the Canadian Chev MCP trucks, and to be able to recognize the differences in images.

While there have been various opinions on the correct ID of this truck, I believe it to be a 1543X2 with 10.50 x 16 tires built before serial number 1154305001 (translated to the 5001st model 1543 built in 1941).

While the axles, wheels and tires are missing, it has the widened fenders indicative of the fitting of 10.50 x16 tires, it has the remains of one of the unique headlights which were fitted to the early 1543X2 with 10.50 x 16 tires, it has the remains of the spare tire mount as fitted to these early vehicles, it has a complete cab which excludes an ID of 1541 (flat face cowl), or 1542 (windshield cowl).

We can see the (upside down) bumper with attached Extension - front bumper frames, which is missing the holes for the Guard assembly, radiator crash (which is correct as these were not fitted until after serial number 1154305001), and this bumper also doesn’t have the large holes near the ends for the Reflector and Bracket assembly which were only fitted between serial numbers 1154305001, and 3154300001 (the first vehicle in 1943).

To me, the only obvious modification performed in-theatre, is the addition of the sand-mat holders on the fenders.

[Grant Bowker]

Following the discussion of how and where the outlet was mounted on MCP, I recently came across a through-frame outlet on a Chevrolet CMP frame that was being prepared for scrap. Don't cry, the frame really was beyond help. (heavily delaminated, shortened, non-standard wheelabse, bent, abused....)
The photos show where it was located on the CMP frame (between the left-hand step brackets) and the fitting. One end is shaped to take a standard 45 degree SAE (single) flare (see photo of mocked up 5/16" tube), the other is threaded similar to a schraeder tire valve stem. Although rusted, it looks to have been threaded both outside for a protective cap and inside to suit a valve core. I don't understand why they would have put a valve core here as any hose to inflate a tire would have had to incorporate a device to press the core open - otherwise the pressure from the pump would keep forcing the core closed so no air would flow. (and the core would restrict flow...)

[Grant Bowker]

More photos, inside of frame view and the fitting.
For those who are curious, the outside of the part that passes through the frame is threaded 1/2-20.
I believe the fitting is described as "connection assembly, tire pump frame" in the parts list which would make it part number 1799265 which doesn't have an asterisk* as a unique to CMP. But, I don't see that part number in the Chevrolet Master parts list 1929-1948....

[Hanno Spoelstra]

An incredible level of detail has come to light on this subject. Great to see how MLU members are collaborating in researching this vehicles!

I have attached two relevant pages from the AEDB Design Record, one of which was posted by Colin earlier.

It struck me that no maintenance manual is listed for the 1533X2, something I had not noted earlier. I would like to know if any of the other references listed have survived somewhere? They would be a goldmine for further info!

Design_Record_Volume_5_Basic_Bodies_and_Non-technical_Vehicles_0119.jpg Design_Record_Volume _4_Self_Propelled_Mechanical_Transport_Chassis_0061.jpg

[Tony Smith]

Interesting that the picture of the Pump shows the Ford version, fitted to a Ford gearbox!