Trailer, Workshop Servicing, 20-cwt, 2-wh
 

Here's one of the many variations of the Canadian 20-cwt Trailer, the workshop servicing trailer.

Attachment 12546

Anybody know what the trailer carried? - presumably it was not just hand tools and spares because a GS trailer could carry those. Is this the same as "Trailer, Light servicing" which I understood to be normally towed by a 15Cwt truck (would that cope with a 20Cwt trailer?).

Noel

what it carries
 

From Canada's Fighting Vehicles....
The AEDB design record describes the Machinery Trailer Type "Mobile Servicing - Light" which seems to be the same thing (both seem to be 15-P-LUB or 20-P-LUB depending on which chassis they were mounted on) which also includes a 6-8V generator driven off the compressor flywheel.
Beyond this, I don't know much.

Mine
 

This is mine..

Rolf

Attachment 37896
http://www.surfacezero.com/g503/data...edusert3gp.jpg

I hope these scans of data sheets are readable,way back in the 1960s a batch of CMP data sheets were copied for me on what at the time we thought were cats whiskers photocopiers but which by todays standards were crap. I have played with them best i can so here goes first is the 15cwt mobile sevicing

The 20cwt mobile servicing

This looks like one of these trailers, towed by a 15-cwt KL Welder?

Attachment 58491
Source: http://www.oudommen.nl/bevrijding-van-ommen/

The KL towed the gas welding trailer, as a companion to the kit on the KL. Hard to say if the trailer shown in the photo is the servicing trailer or the gas welding.

The Canadian forces continued with the lube servicing trailers on the M series of trailers, and right into the 90s. They have pretty much been removed from service now I believe, but in the old days every unit seemed to have one. I may have a parts manual for the lub servicing units from later models, which I suspect was similar to the wartime unit. Evidence of the similarity could be found in the lube kit which came with the trailer, and included the button style grease gun fittings like bren carriers used.

There is a photo of the trailer in use on page 207 and of the back contents of the trailer on p 208 of "Europe WW2" by Bill Gregg.

Took me a few minutes to figure out how to copy it from it's format to something I could post here, but hopefully here it is. Here is the present day lube unit, or at least as it existed in 2002.

Attachment 75723
http://smg.photobucket.com/user/sten...2b5a5.png.html
http://img.photobucket.com/albums/v2...ps93e2b5a5.png

From Vol 2 of the upcoming "Drive to Victory"

Attachment 75724
http://www.servicepub.com/images/trailers1.jpg

Attachment 75725
http://www.servicepub.com/images/trailers2.jpg

Who would have thought these trailers migrated all the way down to New Zealand? It served for a long time - maybe it's stil there...


Caption: "Side view of a covered trailer. RNZAF Base Whenuapai."
Image Date: 01/09/1966

Attachment 117966
Source: https://fotoweb.airforcemuseum.co.nz...36-66.jpg.info

Here's one in service with the postwar Dutch Army, photo dated 1951.

Attachment 124790
Source: https://nimh-beeldbank.defensie.nl/f...d-b0eb600e9c22

Thank you Hanno,
The photo above is the clearest picture I have ever seen of the mechanism used to support the folding sides of the CMP 15 cwt trailer. When you were researching the servicing trailer, did you notice any other photos showing the support rods and mechanism?

Hello Grant,

There are not many pictures or other details available of this type of trailer, let alone clear ones like the one in the Dutch Defense image bank.

The mechanism seems to be a J-shape track that guides a stay to keep the sides at 90-deg. or vertical.

Maybe Rolf still has his trailer and could share some detail pics?

Attachment 124818

Thank you. I agree with what you say, with additions: The J tracks have two positions to hold the sides (called flare boards in the AEDB record - I've no idea whether this indicates they are always flared or if they get up to vertical) horizontal and at an intermediate position before reaching vertical (or nearly so). The support rods look like they are probably round (makes sense as they would be equally likely to buckle in any direction under an axial load) I have no idea whether tube or solid bar. Tube would be lighter for the same strength, but weight never seems to have been a worry in CMP construction. There appear to be flat sections at the end of the supports for pivots to pass through. On the remains of the original body work on my trailer, the lower pivots are threaded and drilled for a cotter pin (the sides must have been removed a long time ago as all of the holes are clear - no rusted remains of cotter pins in any hole). In your photos, the upper ends of the rod appear to have a cross pin (not sure if bent or welded on) that must be threaded as there look to be wing nuts to keep it in place in the J slots.
That's about all I can draw from the pictures, I may have to make a mock-up to try to figure out the geometry of the bars and J slots. On first appearances, I'm not sure whether a straight bar with the cross pivots on its centerline would clear the reinforcements at the join between body and flare board if the flare board is truly vertical - another reason to make tha mock-up.
The pictures in the manual for the trailer are much lower quality than what you provided but they do all seem to generally agree.

The two left hand photos in post #10 show the sides at about 45 degrees and with a tilt fitted over them. That must be with the stays hooked into the intermediate position, with the two extremes giving horizontal and vertical. I think that the bars would clear the top rail of the fixed sides as the J slots are some distance out from the outside face of the flare board.

David

Here are some images from Maintenance Manual SB-1

Excellent, thanks Colin!

Nice detail view of the contents of the Workshop Servicing Trailer:

"Trailer"
RCAF photo, no location, date 10 Apr. 1942.
Attachment 136576
Source: http://central.bac-lac.gc.ca/.redire...82093&lang=eng

Trailer, yes - but a different role
 

That "1980 Military maintenance trailer" looks like the equivalent of the WW2 Trailer, Workshop Servicing, 20-cwt, 2-wh to me

Attachment 136617

The "1980" maintenance trailer is more likely a 1984 model made by Manac for the MLVW series of trucks. You can tell it is a Manac by the big fred flinstone wheel on the hitch. The compressor and pump set are very similar to the WW2 lubrication and servicing trailers. Post war they were on the M101 3/4 ton trailers, and during the 1980s, they were upgraded to the diesel engined compressor and mounted on the M104Cdn3 1-1/2 ton trailers.

Lubrication Kit
 

As Rob stated, the post-war lubrication kits were first mounted on the M101CDN ¾ Ton Trailer and this image is from the 1957 installation instructions.

Attachment 136621