Air Tanks; Trailer Hydraulic Brakes - Zetor 86 41 forterra turbo Operator's Manual

AIR TANKS

Tractors are equipped with an air tank of
capacity 12 l as a standard. The air tank
is located on the right side of tractor in
front of the rear axle.
When the tractor is equipped with air
trailer brakes an extra air tank of ca-
pacity 12 l is assembled on the left hand
side of tractor in front of the rear axle as
a standard.
Both air tanks are assembled on
tractors Z 11741 as a standard
DRIVE OPERATIONS
F111a

TRAILER HYDRAULIC BRAKES

Control of the trailer hydraulic brakes is synchronized with that of the tractor brakes
including their braking effects. The operating pressure is generated with the oil sup-
plied with a hydraulic system gear pump (1) operating continuously. Behind the
pump, still before the additional hydraulic distributor, there is a brake valve (2) in-
stalled in the circuit.
The trailer brake valve is controlled with the pressure of the brake oil from the main
brake cylinder depending on the pressure applied to the brake pedal. When the
brake pedal is depressed at maximum, the pressure on the coupling head (4) has to
be between 12 and 15 MPa. The trailer brake valve prioritizes the brake operation to
the hydraulic control. When deaerating the brakes, do not forget to bleed the brake
valve (2), too with the deaerating screw (3). In case impulses appear in the hydraulic
circuit piping when depressing the brake pedals, the hydraulic hose (5) from the
brake cylinder (2) to the quick coupler (4) has to be deaerated.
79
F114