Allmand Brothers TLB 535 - Manual (Page 15)

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This in turn, at any given input speed, produces a certain flow from the pump. This flow is
transferred through high pressure lines to the motor. The ratio of the volume of flow from
the pump to the fixed displacement of the motor will determine the speed of the motor
output shaft.
Speed of the output shaft is controlled by adjusting the displacement flow of the transmis-
sion. Load ( working pressure) is determined by the external conditions (grade, ground
conditions, etc.) and this establishes the demand on the system.
The motor drives a solid drive coupler bolted directly to a limited slip differential. Both the
motor and differential are rigid mounted in the frame.
The park brake is a 1" band type brake which, when activated by the lever mechanism,
restrains a machined steel drum mounted between the drive motor and the rear differential.
The brake is activated by an adjustable hand lever conveniently located to the right of the
operators seat.
POWER STEERING SYSTEM
The power steering is fully fluid linked. It consists of a manually operated load sensing
steering control valve and a steering cylinder that is attached to the left and right steering
arms. Fluid pressure is supplied from the load sensing gear pump to the steering control
valve and is directed to the appropriate side of the steering cylinder. The steering control
valve is a non-load reaction design which holds the axle position whenever the operator
releases the steering wheel.
HYDRAULIC SYSTEM
Hydraulic oil is contained in the reservoir as described in the “Chassis With Integral
Reservoir” section. Total system capacity is 10 gallons. Oil is drawn from the reservoir
through a 100 mesh suction strainer. A tee fitting allows oil to supply the charge pump in
the hydrostatic transmission as well as the auxiliary circuit gear pump. The hydrostatic
transmission and auxiliary circuit share a common reservoir.
The hydrostatic drive system offers infinitely variable control of speed, both forward and
reverse. The operator controls the hydrostatic transmission with a forward and reverse foot
pedal. The auxiliary circuit supplies oil to the steering control valve as required and to the
loader and backhoe.
Oil is returned into the left reservoir upright through a return filter. A stand pipe internal in
the reservoir returns oil below the reservoir level.