SEM921 self-propelled motor grader

Product Introduction

SEM921 self-propelled motor grader is equipped with imported Rexroth variable plunger pump as standard, which distributes flow on demand and saves energy consumption; Caterpillar’s unique ratio priority and pressure compensation control valve (PPPC) make the machine control more sensitive and improve the overall performance of the machine. performance and efficiency.

Product Features

1. The SEM921 motor grader adopts a load-sensing hydraulic system with proportional priority and pressure compensation, which provides predictable and accurate tool movement, improves work quality and work efficiency, and the frame adopts a box-shaped structure with flanges, and Caterpillar self-made The rear axle ensures that the machine is strong and durable, the cab is tall and spacious, and the standard air conditioner is more comfortable; the lower manipulation force and stroke reduce driver fatigue. 2. Caterpillar's self-made rear axle improves the bearing arrangement, distributes loads reasonably, and improves life; caliper disc brakes improve performance by 20% and are more reliable; four-planetary gears arrange the final drive, which has a stronger bearing capacity; external brakes, maintenance Convenient; no grease injection required, saving time, labor and money. 3. The electro-hydraulic controlled seven-hole linkage mechanism can complete hole position switching in the cab. Using a suitable hole position can ensure that the blade can reach the bottom of the ditch when clearing the overgrown vegetation in the ditch. Through the adjustment of the hole position of the connecting rod, the angle between the blade and the ground can be better adjusted, which is convenient for repairing the drainage ditch and the back slope of the river bank. When positioned at the end hole, the blade can reach 90 degrees perpendicular to the ground, which is convenient for high back slope operations. Replaceable bushings are standard in the connecting rod bore for easy maintenance and repair, reducing service time and maintenance costs. 4. The blade floating function is equipped as standard, which reduces the difficulty of work and improves work efficiency. When the double oil cylinders are floating at the same time, the blade relies on its own gravity to cling to the ground and move up and down with the undulation of the ground to protect the hard road. Used for snow removal and road rubbish removal. The single lifting cylinder is floating, which can make one side of the blade close to the hard working surface, and the other side of the lifting cylinder is used to control the inclination of the blade. 5. The PPPC (Proportion Priority, Pressure Compensation) control valve specially designed by Caterpillar for motor graders distributes power according to demand and flow according to proportion, ensuring that the driver can operate the machine to complete multiple compound actions and significantly improve work efficiency. The variable displacement plunger pump is used to reduce energy loss, reduce heat generated by the hydraulic system, and reduce fuel consumption. Load-sensing hydraulics provide predictable, precise implement movement for improved work quality and productivity.  The PPPC valve has a built-in lock valve to prevent internal leakage of the valve core, maintain the position of the machine tool when there is no hydraulic operation, and ensure the quality of work; prevent accidental movement of the machine tool and avoid accidental injury to personnel. 6. The box-shaped structure design with flange keeps the high-stress area away from the weld seam, which improves reliability and durability and prolongs the service life of structural parts. The continuous top and bottom plate structure provides good consistent strength and fully complies with the design requirements of Caterpillar's structural parts, which can prolong the life of the front frame and reduce the cost of use. The pipes are arranged on the side of the front frame for easy maintenance. Key parts use self-lubricating bushings to improve reliability and reduce maintenance costs. 7. The cab is located on the front frame, and the position of the traction frame, turntable and blade can be clearly seen, which is helpful for the driver to control the position of the blade more precisely. Tall and spacious (1.9 meters high), it can be operated standing up, and its volume is 30% larger. The steering of the front wheels can be clearly seen when the waist is bent, ensuring the safety and accuracy of the operation.