12M Series 3, 140M Series 3, 160M Series 3, 140, 150 and and 160 Motor Graders Blade Cushion - If Equipped Caterpillar


Blade Cushion - If Equipped
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1.1. Blade Cushion that is Deactivated
2.1. Blade Cushion that is Activated


Illustration 1g02170277
(1) Blade cushion accumulators
(2) Solenoid operated valves


Illustration 2g02170254
(3) Blade cushion switch

The blade cushion dampens the shocks that are made in the blade lift hydraulic circuit when the blade contacts an object that will not move. Blade cushion accumulators (1) have a nitrogen precharge pressure that provides the cushion.

The blade cushion is activated by blade cushion switch (3) on the right side of the operator on the shift console. Blade cushion switch (3) energizes the solenoids which control the check valves for the blade cushion. A manifold is located at the base of blade cushion accumulators (1). Each manifold contains an oil passage to the corresponding blade cushion accumulator (1). Solenoid operated valves (2) are mounted to the manifolds. Solenoid operated valves (2) regulate the flow of oil to blade cushion accumulators (1).

Blade Cushion that is Deactivated



Illustration 3g03520938
Blade cushion that is deactivated
(1) Blade cushion accumulator
(2) Solenoid operated valve
(3) Blade cushion switch
(4) Centershift lock/Blade cushion fuse
(5) Fuse block A
(6) Hydraulic line to implement control valve

With blade cushion switch (3) in the OFF position, the solenoids are de-energized. Oil pressure from the lift cylinders cannot pass through the manifolds in order to enter blade cushion accumulators (1). In this position, the cartridge assemblies in the manifolds contain one-way check valves. The one-way check valves allow cushion accumulator oil into the head of the blade lift cylinders. The one-way check valves prevent oil from flowing back into blade cushion accumulators (1).

Blade Cushion that is Activated



Illustration 4g03587181
Blade cushion that is activated
(1) Blade cushion accumulator
(2) Solenoid operated valve
(3) Blade cushion switch
(4) Centershift lock/Blade cushion fuse
(5) Fuse block A
(6) Hydraulic line to implement control valve

With blade cushion switch (3) in the ON position, the solenoids are energized. The cartridge assemblies shift in the manifolds. There is now an open passage from the hydraulic circuit to blade cushion accumulators (1).

When a shock occurs, oil pressure flows through the lines and the manifolds into blade cushion accumulators (1). Accumulators (1) cushion the force of the pressure oil in the hydraulic circuit. Once the shock has passed, pressure oil from blade cushion accumulators (1) re-enters the hydraulic circuit. Oil flows back into the head end of the blade lift cylinders. The oil allows the blade to return to the original position.

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