Replacing M4 Tank Final-Drive Assemblies

Instructions for replacing the final-drive assembly on the M4 Sherman tank, from Army Motors, Vol. 6, No. 2, Maintenance Division, Office, Chief of Ordnance, May 1945.

Replacing M4 Tank Final-Drive Assemblies

Time was when M4 medium tanks with damaged power trains had to run home to mother for mending–like little apple-filchers with buckshot in their final drive assemblies. Now, when your M4-series job (or related gun or howitzer motor carriage) has something more like dribble where the drive should be, you don’t have to pack it off to some 4th-echelon tank hospital for a slow cure. Instead, you can put in a whole new controlled differential and transmission final-drive assembly right there in the field, according to TB ORD 275.

Four of these assemblies, complete with everything but whistles, have at last been made authorized items of issue for lower echelon installation. They are:

—  1-piece differential housing, single-anchor-brake type, Ord. Part No. A5700061, Official Stock No. G104-5700061.

—  1-piece differential housing, double-anchor-brake type, Ord. Part No. A5700062, Official Stock No. G104-5700062 (Fig. 1).

—  3-piece differential housing, single-anchor-brake type, Ord. Part A5700060, Official Stock No. G104-5700060 (Fig. 2).

—  3-piece differential housing, double-anchor-brake type, Ord. Part No. A57000196, Official Stock No. G104-57000196.

They’ll be assembled at your favorite base shop or Ordnance supply depot from parts and housings already in stock or made available through cannibalization. No important difference between any of them, and they’re all yours for the asking.

Final Drive Assembly

All you have to do is install ’em and send back the has-beens. But remember that the whole system will break down if you don’t send back complete assemblies. Only the final-reduction sub-assemblies (A294625) should be removed from a damaged unit before its sent to the rear for reconditioning.

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Don’t Be A Dope VI

An illustration from the “Don’t be a Dope!” series was included in the M36 tank destroyer technical manual.

dont-be-a-dope-vi-m36-tank

 

M3 Medium Tank Armament

Diagram of the armament and ammunition storage of the M3 Medium Tank. (Source: TM 9-750: Ordnance Maintenance, Medium Tanks M3, M3A1, and M3A2, Technical Manual, U.S. War Department, May 1942.)

M3 Medium Tank Armament

 

Valentine Tank Bogie Wheels

Diagram of Valentine tank bogie wheels from the WW2 Russian manual.

 

Wittmann’s Command Tiger from Dragon

Dragon Models is releasing a new 1/35th-scale kit in their ’39-’45 Series depicting Michael Wittmann’s Tiger: Item 6730 – Tiger 1 Early Production Pz.Kpfw.VI, Ausf. E Wittmann’s Command Tiger. Dragon’s brand new is designed to represent Wittmann’s famous “S04” Tiger on the Eastern Front with 88 kill markings painted on the 88mm gun barrel.

dragon-wittmann-command-tiger

 

M4 Medium Tank Characteristics

Summary of M4 SHerman tank characteristics from the training booklet Tracked Vehicle Chassis Units, The Armored School, Fort Knox.

MEDIUM TANK, M4 SERIES

SIDE VIEW

SIDE VIEW

2. DESCRIPTION. a. Characteristics

Armament:
    76-mm Gun, M1A1
    2 cal .30 machine guns
    1 cal .50 machine guns

Ammunition:
    71 rds 76-mm
    6250 rds cal .30
    660 rds cal .50

Fire Control Equipment:
    Telescope, M71D
    Periscope, M10 or M4A1
    Elevation Quadrant, M9
    Gunner’s Quadrant, M1

Vision Devices:
    Vision cupola
    Periscopes, M6 (4 each)

Crew:
    5 men

 Engine:
    Ford, 500 HP @ 2800 rpms
    Model GAN, V-8

Clutch:
    Double plate

Transmission:
    Synchromesh, 5 speeds forward and 1 reverse

Steering:
    Controlled differential

Tracks:
    23″ steel chevron, rubber backed, double pin, T80
    23″ rubber chevron, double pin, T84

 Dimensions:
    Length, 247″
    Height, 124 7/8″
    Width, 118″

Weight:
    Combat loaded, 71,175 lbs

Fuel Capacity:
    168 gallons

Cruising Range:
    100 miles

Maximum Speed:
    25 mph

Ground Clearance:
    18″

Fording Depth:
    36″

 

M25 40-ton Tank Transporter Truck-Trailer

Description and performance data for the M26 armored tractor from TM 9-767: 40-Ton Tank Transporter Truck-Trailer M25, War Department Technical Manual, U.S. War Department, February 1944. The M25 Tank Transporter, nicknamed the “Dragon Wagon,” was a heavy tank transporter and tank recovery vehicle used by the U.S. Army during World War II.

40-TON TANK TRANSPORTER TRUCK-TRAILER M25

DESCRIPTION.

a. The 40-ton, Tank Transporter Truck-trailer M25 is designed for use in recovering a piece of damaged materiel and transporting it to a place where necessary repairs can be accomplished. The M25 unit consists of the tractor truck (M26) and semitrailer (M15), the semitrailer being coupled to the tractor by means of a fifth wheel on the tractor, which automatically locks the trailer to the tractor. Air brakes on the trailer wheels and lighting equipment on the trailer are connected to the tractor air and lighting systems by means of air hose and a jumper cable (carried on the trailer). The trailer air brakes and lights are controlled by the driver of the tractor. The trailer air brakes are automatically set in case the trailer is accidentally, or purposely, disconnected from the tractor.

40-ton-tank-transporter-dragon-wagon

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M24 Light Tank Illustration

Diagram of the M24 Light Tank. (Source: Technical Manual TM 9-1729A, U.S. War Department, 1944.)

M24 Light Tank

 

M15 40-ton Trailer

Illustrations of the M15 40-ton trailer from TM 9-767: 40-Ton Tank Transporter Truck-Trailer M25, War Department Technical Manual, U.S. War Department, February 1944. The M25 Tank Transporter, nicknamed the “Dragon Wagon,” was a heavy tank transporter and tank recovery vehicle used in World War II that was based on the M26 6×6 armored tractor and the M15 40-ton trailer.

m15-trailer-front-view-dragon-wagon

m15-trailer-rear-view-dragon-wagon

 

M24 Light Tank Powertrain

Diagram of the powertrain of the M24 Chaffee light tank from the U.S. Army training booklet Tracked Vehicle Chassis Units, The Armored School, Fort Knox.

M24 Chaffee Light Tank Powertrain