THE CATERPILLAR 773B DUMP.
Scale: 1/15 th.
ATfter the satisfaction and pleasure provided by the construction of the “992C” model, after having tasted a whole new experience: the exhibition, which was also successful, all that remained was to… continue!
A new Caterpillar model? Okay ! Since this brand of machines had definitely been "anchored" in me since childhood.
The enthusiasm for a new construction was therefore there.
Let us now underline an important change. The model of "992C" is static, good!
Why not now build a model that would work hydraulically, at least try?
The construction of this model is made of steel and brass welded to tin,
the bucket is made of wood.
So the 773B dumper will be born.
Production: from November 1991 to November 1992,
a total of about 1400
hours.
The construction of this model is made of steel and brass welded to tin,
the bucket is made of wood.
Extract from odds statements
dimensional.
The real machine (in the workshop).
Rhigh side
(rear rim depth).
The real machine ...
... and its PDF.
The model (under construction).
Finishing.
Radio-controlled functional model,
electric traction,
bucket lift and hydraulic steering.
Dimensions:
Overall length: 613 mm Overall width: 305 mm Overall height: 300 mm
The functional organs.
Technical details :
Hydraulics:
Hydraulic power is designed and constructed as follows:
- Steering is provided by a radio control servo connected to two "master" cylinders, which act on two "slave" single-acting cylinders, connected to the wheel rudder, all in a closed hydraulic circuit.
- The bucket is lifted by a 12-volt gear pump from the market, connected on the one hand to an oil tank and on the other hand to the double-stage and single-acting bucket cylinders.
Traction :
It is provided by a 12-volt automobile windscreen wiper motor,
including a reduction box with a ratio of: 60/1.
The rear axle includes a conical torque in the ratio: 3/1 with differential.
Electrical energy is provided by a group of ten 1.2 volt 1800 mA batteries
recovered in a portable VCR.
Electric traction motor and
1.2 volt batteries for the traction motor.
Master cylinders.
Steering cylinder (with oil leak ...!)
The tires are personally made, "in house" molded.