Specification General Description - Self-propelled, diesel-electric, one man operated, fully mobile crane with unlimited full circle slewing in either direction.

The crane power unit on the superstructure is a diesel engine directly coupled to a variable speed generator which energises the electric motors of the three crane motions (hoisting, derricking and slowing) and in addition the travel motor, by direct current at a potential varying from zero to maximum value.

Each motion of the crane is controlled by an interlocked pair of heavy duty reversing contactors operated by pilot switches conveniently located in a console in the driver's cab.

The normal driving routine is to engage the pilot switches for the motion or motions desired while the engine is running at reduced speed and thereafter to control the speed of the motion as desired by varying the engine speed through the accelerator. As the engine is accelerated the appropriate electro mechanical brakes are automatically released.

In addition, Coles automatic control and automatic protection is incorporated to safeguard the machine against abuse. This permits the driver to select any motion, irrespective of the engine speed, whereupon the electrical equipment automatically operates to introduce the required motion without shock to the electrical or mechanical components of the crane. No restraint is placed upon the activities of the crane driver and this complete absence of restriction achieves the optimum operating cycle.

The crane revolves on a large diameter double live ring of steel balls running in hardened races. This double race ball bearing obviates the need for a contra post and gives more even distribution of loading on the chassis frame.

The chassis is a carrier specially designed for crane service. Power is transmitted through an electric travel motor and a single speed gearbox which is coupled by a propshaft to the driven axle. The driven axle is of the fully floating type with overhead worm and wheel reduction. Coles automatic reversible steering is fitted to give normal control with the jib over either end of the chassis. Two leading shoe hydraulic brakes are fitted to all wheels. The footbrake acts on all wheels through a mechanical-hydraulic vacuum assisted system and the parking brake operates independently through a mechanical system on the driving wheels only.

CRANE DATA

Engine - Perkins diesel, developing 49 h.p. at 1800 r.p.m. The engine speed is controlled by a foot throttle in the operator's cab. A fuel tank of 12 gallons capacity is fitted.

The Motors and Generator - Have been specially designed as matched machines for our self-propelled crane duty which involves operations over a wide range of current, voltage and speed values and to give the performance figures tabulated under Operating Speeds.

Generator - Variable voltage (0 to 400 volts), variable speed.
Hoist motor - Variable voltage, maximum output 11 h.p.
Derrick motor -Variable voltage, maximum output 11 h.p.
Slew motor - Variable voltage, maximum output 2 h.p.


Brakes - Electro mechanical, automatically applied brakes are fitted to hoist, derrick and slew motions, the shoes being spring applied and released by a continuously rated solenoid coil.

Operator's Cab - Totally enclosed, full vision type with safety glass windows, adjustable seat, door equipped with lock.

Limit Switches - Totally enclosed, automatically self resetting type are fitted to prevent over winding and over lowering on the hoist motion and over derricking beyond prescribed limits.
Radius Indicator - Showing maximum loads at various radii.
Jib - Cantilever type, lattice construction. Basic length 20'0".
Electrical Equipment - 12 volt starting equipment is provided. An electric horn is fitted and all wiring is carried out in P.V.C. insulated cable.

CHASSIS DATA Chassis Frame - Designed specially for crane service and is constructed from steel sections and plates. The frame is electrically arc welded.
Travel Motor - Variable voltage, maximum output 15 h.p.
Gearbox - Single speed 4/1 ratio. Driven Axle and Transmission - Fully floating type axle shafts and differential with a worm and wheel reduction of 13-5/1.
Steering Axle - Is solidly mounted to the chassis frame.
Wheels and Tyres - 12.00 x 20 pneumatics, singles all wheels, fitted on 8.37" flat base rims.
Brakes - Two leading shoe hydraulic brakes, 15.25" dia x 4.25" are fitted to all wheels.
Steering - Coles automatic reversing gear.
Toolbox - With complete tool kit is provided.


OPERATING SPEEDS

HOISTING ON SINGLE LINE

LOAD, TONS | 2 | 1 | LIGHT LINE

SPEED, F.P.M. | 55 | 70 | 85

Derricking -Maximum to minimum radius in 20 seconds.
Slewing - 2 r.p.m. laden.
Travelling - Unladen, up to 4 m.p.h. on firm, level ground.
Laden, up to 2 m.p.h. on firm, level ground.
Turning Radius - 21'- 0" kerb radius.


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Optional Equipment

CRANE

Single Hook - With pearweight for faster hoisting speeds with light loads.

Safe Lend Indicator - Coles B & A automatic indicator gives audible and visual warning of overloads and cuts the hoist and derrick circuit automatically at a predetermined overload.

Grabs and Magnets - Twin rope grabs. hook on self-dumping grabs or ring discharge single chain grabs up to 21/17 cu. ft. capacity. Electro magnets up to 40" dia.

Tabling Spring-loaded drum for control of grabs.

Spring Drum -For use with twin rope grabs.

Electrical Equipment - 2 head lamps, 2 side, 2 tail, radius indicator, jib head, cab and inspection lamps.

Jib - 30'-0" centres.
Bolted Extensions 5'-0" and 10'- 0".
Tropical Cab - With fan and opening windows.
Arctic Cab - With heater and fibreglass insulation.
Windscreen Wiper - Electric heavy duty type.
Telescopic Jib - Manually or power operated.


CHASSIS
Steering - Air pressure, power assisted.
Special Transmission - Larger travel motor and generator for increased tractive effort.


STEELS ENGINEERING PRODUCTS LIMITED C R O W N W O R K S.
SUNDERLAND, ENGLAND · Tel: 56281 (10 lines) Grams: Steel, Sunderland