CMP windshield throwout arm assemblies

[Mike Cecil]

Grant,

I'm not suggesting that an Aust made arm made it to central Canada, but that the mod was also adopted by Canada. My comments were based upon the details provided in a GMH document detailing the changes made to the CMP cab:

'The greatest difference was brought about by the Australian Army requiring horizontal opening windshield and that an inside lever be added to allow the windscreen to be fully opened from a sitting position. Consequently the levers of the Canadian type cab were completely redesigned to meet these requirements. It was noted that the Canadian cab was subsequently redesigned to allow windows to open further, but as our design was finalised, the Canadian alterations were not incorporated." and, under parts added at Army Request, no.5, 'A windshield blind shown on 262-29-18 was required to prevent reflection of light when windshield was open'.

Perhaps both Army's came to the same conclusion independently, but it seems the Aussies got there first - hence the term 'subsequently' (my bolding) in the quote above. The long arms to assist opening, mounted on the central pillar, don't appear to have been incorporated in the CDN mod, only Aust production. They are a scissor-type action with a different shape and action that replace the long slide arms as seen in your image.

Mike

[Charlie Down]

Looking at the reference photos most of the arm components of the 1533X2 are at least similar, if not identical to the CMP versions. The arm itself looks like the short arm, with the upper bracket and the hand wheel clamps looking the same as the CMP equivalents.
The arm length scales out at roughly 192mm/7-1/2" which corresponds closely with your measurements above.
I am mid way through drawing the windscreen, but could do with some help with the following:

Wiper arms
Dimensions of the hand wheel clamps, and photos of both sides.
Photos of the hand wheel bracket on the side of the windscreen, plus dimensions.
Wiper motor photos and dimensions.

In the last photo of an operational truck you can see the motor has been removed, leaving a spaced mounting bracket. Does anyone have any information about this bracket? In post 3 there's a similar bracket visible on a photo, but the 1533X2 bracket looks like it has a lip on the lower edge.
Also of interest is the factory photo of the truck which has a different lower windscreen bracket compared to the much more robust looking brackets of 'later' operational truck. This is the only photo I have seen of this 'early' bracket. This may just be photo distortion, but it does look narrower than the other bracket.

[Grant Bowker]

I only have some of the parts to hand right now to measure.
The short arms measure 7-7/8" as overall length.

The hand wheel (part # 5800946)diameter is 1-29/32" including the lumps for grip, 1-5/8" base diameter at rim. Hub diameter 11/16" (greater as it flares to meet the web). Centre hole threaded 5/16-18. Thickness at the hub 1/2". Thickness at rim 5/16". Web thickness 3/32", centred on the rim. (7/64 inset from rim each side).
Regretably, the bracket mounted to the windshield frame doesn't resemble a CMP part that I'm aware of. (but as above the bolt/stud must be 5/15-18) The reason I keep saying bolt/stud is that samples of early Cab 13 CMP brackets mounted to the cab frame were made from bolt brazed to the bracket but I believe later ones were a stud .