Power Take-Off Equipment

This equipment is what made the utility Land-Rovers adaptable to so many jobs.
(Text and ilustrations from Land-Rover salesman's manual 1972)

INTRODUCTION TO POWER TAKE-OFF DRIVES
In addition to its many roles as a load or personnel carrier, the Land-Rover can equally well be used as a working vehicle with equipment operated from its power take-off facilities. There are three basic drive positions-two of them on the transfer gearbox and the third at the front of the vehicle where a coupling can be made to the engine crankshaft. The transfer gearbox drive units consist of a centre and a bottom power take-off and both of these can be obtained as optional equipment, except for the I-Ton model which does not have the bottom power take-off
facility. They form the basic drive for several variations of power take-off layout. For these applications the four main forward gears may be used to provide a wide range of speeds, but fourth gear should be used whenever possible. The intermediate gears can be used where lower speeds are required, but their use should be restricted to light loads, and duties of an intermittent nature. When the vehicle is moving the centre and bottom drive units will operate at a speed which is in direct proportion to the road speed of the vehicle and in a ratio according to the transfer gear selected. For stationary operation, the transfer gearbox is placed in neutral to disconnect the drive to the wheels and then the centre and bottom drive units can operate independently over a wide speed range. An engine crankshaft drive can be used for a number of purposes, with installations provided by Specialist Manufacturers for specific applications. Driving equipment from this point has the advantage that the power supply is not dependent on road speed and gear selection and will be uninterrupted during combined stationary and mobile operation. Certain design limitations apply, however, and these are discussed later. This drive position is restricted by space, and should be confined to units having a low rotary inertia, such as small fluid pumps. Power take-off facilities are restricted with the 2.6 litre Petrol Engine and any proposed take-off application should be submitted to Land-Rover Special Projects department for scrutiny. The following sections give details of the basic units available as optional equipment and suggestions as to how these may be used in various drive arrangements to suit different machinery installations.

CENTRE POWER TAKE-OFF ~
The two transfer gearbox drive units are :- 
MECHANICAL. This is a drive unit mounted on the rear of the transfer gearbox, terminating in a Hardy Spicer 1300 Series Flange.

HYDRAULIC. An alternative drive unit with an integral hydraulic pump can be provided, with a capacity of 6.5 g.p.m. (29.5 L/min.) at 1,500 rev/min and a maximum pressure of 3,000 Ib.in2 (141 kg/cm2). Complete installations using this unit or alternative pump sizes can be provided by specialist manufacturers.

BOTTOM POWER TAKE-OFF
This is an auxiliary gearbox attached at the base of the Transfer Gearbox and driven via the Transfer Gearbox Intermediate gears. (Not suitable for 109 inch I-Ton.) To this auxiliary gearbox can be added the same mechanical and hydraulic drive units used at the centre power take-off. Direction of rotation is reversed and, therefore, for the hydraulic unit, the pump must have the reverse direction of rotation. A particular application of the bottom power take-off is to enable a hydraulic winch to be fitted when the centre power take-off is required for other purposes. Care must be taken with the mechanical arrangement that ground clearance of the driven machinery is sufficient.

Note: Engagement of each drive is by a separate dog clutch which can be selected by a control knob in the driving compartment. Before engagement is made for stationary running the transfer gearbox must be placed in the neutral position to disengage the drive to the wheels.

Centre Power Take-off Extensions (including Rear Power Take-off)
A. Centre power take-off with direct 'V' belt drive. Pulley not supplied from the factory. Horse-power should be limited (approx. 20) to avoid interference from flexible gearbox mountings. Note: This drive may be incorporated together with the other variations shown, but one or two clutches may be required to allow selection of one drive or the other.

B. Centre power take-off, with propeller shaft to machinery mounted below floor of rear body. Propeller shaft not supplied by The Rover Company.

C. Centre power take-off, with propeller shaft drive to outrigger bearing mounted in chassis frame, then by 'V' belt to machinery mounted in rear body section. Shaft, outrigger bearing and pulley not supplied by The Rover Company.

D. Rear power take-off mounted on rear crossmember driven by propeller shaft from centre power take-off. Standard .833 step up ratio in power take-off gearbox capable of being reversed to give 1.20 step down ratio. Alternative ratios available.

Drive by 'V' belt to machines mounted on rear of vehicle. Complete drive arrangement except rear 'V' belt pulley can be obtained as Optional Equipment.

E. Rear power take-off with Flat Belt Drive unit added for driving remote stationary machinery usually of an agricultural nature. Belt Drive unit is Optional Equip- ment.

F. Rear power take-off with a propeller shaft attached to splined output shaft. The drive is applied usually for trailer mounted equipment. It can also be used for driving remote stationary machinery. Final drive shaft not supplied by The Rover Company.