egorogr

Hello. What was the part number of the M34 mount 75mm gun cradle?

Is there any good reference of foundry symbol and part number on cradle?

What type of hydraulic turret traversing mechanism was installed on M4A2 in the beginning of 1943?

There were several  variants, and it seems hard to understand for me which was the most typical for that period.

Are there any detailed photos or schemes?

On 11/10/2018 at 4:15 AM, DogDodger said:

After messing around a bit with the warning plate for the blackout switch, I've come up with

 

 

Pulling on the switch activated the blackout marker and taillights and blackout stoplight; to get to the second (service headlights and blackout stop light) or third (service stop lights with no other lights) detents you had to press the locking button on the left as you pulled the switch. Not much help, but it may be a start.

 

Edit: The last line may be "1^ST STAGE - BLACK-OUT"?

Thank you!

As for air heater I got some thing like this:

Early:

AIR HEATER INSTRUCTIONS
1 TURN ON AIR HEATER SWITCH
2 WITH ENGINE THROTTLE WIDE OPEN
  ENGAGE STARTER
3 OPERATE PUMP WITH SMOOTH EVEN
  STROKES APPLYING A FIRM PRESSURE
  OF 10 POUNDS OR MORE OF PUMPING
  STROKE
4 WITH ENGINE RUNNING REGULATE
  THROTTLE AND TURN PLUNGER ALL THE
  WAY UNTIL LOCK ENGAGES
5 TURN OFF AIR HEATER SWITCH
WARNING
FOR COLD WEATHER STARTING ONLY

Late:

AIR HEATER INSTRUCTIONS
1 TURN ON AIR HEATER SWITCH
2 WITH ENGINE THROTTLE WIDE OPEN ENGAGE
  STARTER
3 RELEASE PUMP PLUNGER 1/2 TURN IN COUNTER
  CLOCKWISE DIRECTION AND OPERATE PUMP
  WITH SMOOTH EVEN STROKES APPLYING A
  FIRM EVEN PRESSURE OF 10 POUNDS OR MORE
  OF PUMPING STROKE
4 WITH ENGINE RUNNING REGULATE THROTTLE
  PUSH PLUNGER IN ALL THE WAY AND TURN
  CLOCKWISE UNTIL LOCK ENGAGES
5 TURN OFF AIR HEATER SWITCH
WARNING
FOR COLD WEATHER STARTING ONLY

Another question is about early splithatch cupola.

"Son of Sherman" book says the earliest cupola part number was D51050, if I got it right.

But it seems to me the number on this photo is D51045.

So was the D51050 cupola not the first but the second type actually?

Does anyone know what were part numbers for the hatches of this type of copola or any oher split hatch type? Are there any good examples?

Are there any good references for D51050 cupola, so that the number is visible clearly?

Does anyone know exact text for blackout and air heater instruction plates on early M4A2 instruments panel (or on any other if these instructions were the same)?

6 hours ago, Jeeps_Guns_Tanks said:

 

 

I have this, it's from the ORD 9 SNL G-205 parts catalog for the M4A3 

And this slightly different one from the ORD 9 on the M4A2

 

Thanks

Is there any description of how it works?
It seems A - handle controled brake, which changes, how easily cupola could be rotaded. And E - knob (D on the second picture) locked cupola in certain positions.

Hello

Is there any detailed photos or schemes of early split hatch cupola's race lock assembly?

It seems to be similar to later type in general, but looks different in details.