The cushion-hitch pump is an axial piston type pump which is mounted to the steering pump on the front of the transfer case at the rear of the tractor. The cushion-hitch pump provides system pressure for the cushion-hitch system and pilot pressure for the implement system.
The cushion-hitch accumulators are mounted to the right-hand side of the hitch frame.
The cushion-hitch leveling valve is on the right-hand side of the tractor below the cushion-hitch accumulators.
Cushion-Hitch Ride Dampening Valve
The cushion-hitch dampening valve is on the right-hand side of the tractor below the cushion-hitch accumulators.
The load cylinder is mounted to the hitch frame. The cushion-hitch position sensor is located in the load cylinder.
The pilot control manifold is on the left side of the hitch assembly. The pilot control manifold contains the pressure reducing valve for the pilot system and the cushion-hitch leveling solenoid.
Cushion-Hitch/Pilot Oil Filter
The cushion-hitch/pilot oil filter is located in the center rear of the tractor.
View of 631K and 637K bowl cylinder|
The bowl cylinders are on either side of the machine, mounted to the draft tube. The lift cylinders cause the bowl to raise or lower.
The apron cylinder is mounted to the draft tube in the middle of the gooseneck.
View of bottom side of machine|
The ejector cylinder is at the rear of the scraper.
The implement pump is mounted to the transfer case at the rear of the tractor. The implement pump provides system pressure for the bowl, apron, and ejector.
Implement Control Valve, Pilot Control Solenoid, and Pilot Oil Accumulator
The implement control valve, pilot control solenoid, and pilot oil accumulator are on the right-hand side of the draft tube of the scraper.
Hydraulic oil tank is located on the right-hand side of the machine. The hydraulic oil temperature sensor is mounted in the hydraulic oil tank. The hydraulic return filter is located inside the hydraulic oil tank.
The implements and the cushion hitch systems are supplied by the hydraulic oil tank.
Bowl Lever and Ejector Lever Sensor
The bowl lever and ejector lever sensors are located in the base of the joystick control on the right side of the operator seat.
The bowl lever and ejector lever sensor are used by the operator to control the raise and lower functions of the bowl and the forward and return functions of the ejector.
The thumb wheel on the joystick controls the direction of the apron.
The bail switch is located on the joystick control on the right side of the operator seat. The bail switch is used by the operator to raise or lower the bail cylinder on the 621K and 627K.
The cushion-hitch switch is located on the joystick control on the right side of the operator seat. The cushion-hitch switch is used by the operator to activate or deactivate the cushion-hitch system.
The implement lockout switch is located on the console to the right side of the operator seat. The implement lockout switch prevents movement of the implement system.
Implement Electronic Control Module
The implement electronic control module is located behind the operator's seat, in the rear access panel. The electronic control module controls all electronic signals from the implement system, including solenoids, sensors, and switches.
The cushion-hitch electronic control module is mounted to the cushion-hitch accumulator bracket on the right side of the tractor.
The bail cylinder is mounted to the front bumper.
Push-Pull Control Valve (If Equipped)
The push-pull control valve is mounted to the inside of the left-hand frame rail of the tractor, near the engine.