3 Ton Scarab Mechanical Horse

6 Ton Scarab Mechanical Horse

ENGINE AND TRANSMISSION GENERAL

Engine, clutch, gearbox and driving axle built on Unit construction principle mounted at the front on large rubber bush

ENGINE

4 Cylinder, three bearing fully counter-balanced crankshaft, Lubrication by dry sump principle from submerged gear pump. 3-7/16″ bore by 3-7/16″ stroke. 2,090 cc.

CLUTCH

Single dry plate Borg and Beck clutch housed in aluminium bell housing.
9-1/4″ diameter 3 Ton and Petrol 6 Ton
10-1/4″ diameter Diesel 6 Ton

GEAR BOX

Four forward and one reverse speed; all rations except revers and 1st engaged by dogs.
Ratios
1st 6.3:1
2nd 3.0:1
3rd 1.68:1
4th 1:1
Rev 8.4:1

DRIVING AXLE

Double reduction fully floating type. All shafts mounted on anti-friction bearings and hubs on Timken taper roller bearings. 4 pinion differential.
Overall Ratios
6.47:1 or 9.65:1 3 Ton Petrol
7.5:1 or 9.65:1 3 Ton Diesel
11.2:1 6 Ton Petrol
13.2:1 8 – 10 Ton Petrol
15.9:1 6 Ton for Special Requirements
7.5:1 6 Ton Diesel

FUEL TANK

14-gallons capacity. Mechanical pump on engine.

BRAKES

Foot pedal applied brake on driving axle mechanically, and brake on trailer axle by means of a vacuum servo on the tractor. Balance between tractor and trailer brakes is assured by use of a large diameter control valve. Vacuum reservoir is provided. Motive Unit handbrake applied brakes on driving axle. Trailer handbrake applies brakes on trailer by means a slipper and bell crank lever on coupling gear.

SPRINGS (Driving Axle)

Semi-elliptic leaf springs bearing against slippers carried in brackets attached to the ramp pressing.

RADIATOR

Morris type with detachable pressed top and bottom tanks. An air duct is provided to allow circulation of air by means of a fan mounted on the front of the engine.

STARTING

Hand starter provided in addition to electric starter.

STEERING

Skew gear with enclosed steering shaft. 16″ steering wheel, ratio 12.5:1.
6 Ton available in left hand drive.

CAB

Of all steel construction

FRONT SUSPENSION

By coil spring totally enclosed and immersed in oil. Spring movement damped hydraulicly

FRAME

Pressed steel fabricated side members of channel section down swept in the middle to give low floor height in the cab. All crossmembers tubular, except front intermediate which is channel and all bolted into position.

COUPLING GEAR

Scammell patent coupling gear incorporating pressed steel ramps and fabricated buffer and spring brackets, Coupling hook and guide bracket carrier on rear tubular crossmember to which is also bolted the rear diagonal stays making a very rigid assembly at the rear end of the frame. Release lever fitted in the cab incorporating safety catch.

ELECTRICAL EQUIPMENT

12-volt constant voltage regulated dynamo and 12-volt starter.
Electric windscreen wiper, horn, one headlight, two rubbolite sidelamps and taillamps.

TYRES

Overseas
7″ x 20″ twins in place of 10-1/2″ x 13″ singles available

DIMENTIONS