contractors
plant
PILE DRIVER
A combination pile driver/soil com- pactor developed by Allied Steel and Tractor Products, Inc., 19200 Cran- wood Parkway, Cleveland, Ohio, USA,
9000 Ho-Pac pile driver
is hydraulically driven and is mounted on back-hoes of 35 gallons per minute or more capacity at pressures from 1,500 to 2,500 p.s.i.
The 9000 Ho-Pac has an impulse force of 11,300 lb. at 2,000 cycles per minute. The weight is 1,290 lb. Op- eration is controlled by an on-off valve located near the operator.
Due to its high impulse force, vibtatory effect and the down pressure applied by the back-hoe, the unit is highly effective both as a driver of timber and smaller steel sheet piling and as a soil compactor.
As a soil compactor it is capable of compacting clay in lifts of 3 to 4 ft. and sand in lifts of 5 to 7ft. It can be
used on a single job in both a pile driving and soil compacting role with- out conversion.
The machine can operate in any direction, enabling it to compact sloped lifts, and to drive batter piles or hori- zontal pipe. Back-hoe mounting makes reaching into trenches or other difficult locations for compaction easier.
CRAWLER LOADER
With a 1 cu. yd. (1 1/3 cu. m.) rated bucket and 110 fly-wheel h.p. at 1,800 r.p.m., the 7G series B crawler loader has two principal operating levers bucket control and power shift.
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Steering and braking are controlled by two foot pedals, one for each track. The operator depresses the pedal half- way to disengage the steering clutch and all the way to apply the brake. A master brake pedal controls both tracks.
Manufactured by Allis-Chalmers, Milwaukee, Wis., USA, the crawler is powered by the 110 h.p. Model 3500 diesel engine. A rotating housing type torque converter balances the available engine power between hydraulic and tractive efforts. Engine torque can be multiplied up to 3.3 to 1 ratio. The power shift transmission has two speeds forward, up to 5.1 m.p.h. (8.2 km/hr.) and two speed reverse.
Double-wrap brakes, which can be applied whether the engine is running or not, use the principle of a rope wrapped once around a tree pulling in opposite directions, thus creating a
positive holding force. Track rollers, idlers and support rollers are per- manently lubricated and the track is sealed.
Overall width of the crawler is 6ft. 82in. (2.04 m); tread is 62in. (1.57 m), and length is 15ft. 8in. (4.77 m).
Agents are Jardine Engineering Corp., Ltd., Hong Kong; South East Asia Tractors, Ltd., Singapore; Thaitrac Co. Ltd., Bangkok, and Honiron Philip- pines Inc., Manila.
WELDING GENERATOR
Features of the Pipe Major mobile welding generator are a high open- circuit voltage to reduce slag, coarse and fine voltage controls giving in- finitely variable regulation over the whole range, and a 1 kW power outlet for hand tools. The generator produces 35-400 amp. at an open circuit voltage of 50-85 v, continuous current being 30 amp. and maximum intermittent current, 400 amp.
The fan-cooled, drip-proof genera- tor is of the cumulatively compound- wound type with a slotted-pole field system giving the necessary dropping voltage characteristics for minimum external resistance. It is self-exciting, with no external switches or circuitry. Continuously-variable current control is achieved by the special "brush-shift" rigging, regulated by a handwheel mov- ing over a colour-coded scale.
Voltage control is also colour coded, and there is a polarity switch for shift- ing between positive and negative. All these controls are on a panel, accessible through a drop-down door in the front end of the casing. The 14-kW., 110-v. d.c. power socket is also accessible from this point.
Power is supplied, through a flexible coupling, from a choice of two three- cylinder industrial diesels: an air-cooled Lister HA.3, delivering 28.5 b.h.p. at 1,500 r.p.m.; or a water cooled Perkin's 3.152 with an output of 32.5 b.h.p. at 1,800 r.p.m.
The makers are Welding Industries Ltd., Blackswarth Road, Bristol 5, UK.
TG SEMES R
Allis-Chalmers 7G series B crawler loader
Pipe Major welding generator
Far East BUILDER, May 1969
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