Roller

SAUER DANFOSS roller M44 hydraulic pump

The test and repair process of the M44 and M46 main pumps from Sauer-Danfoss is conducted with precise engineering and numerical evaluation. Initially, the pump is removed from the hydraulic system, and a **preliminary inspection for leakage and pressure** is performed. System pressures are measured numerically using a digital pressure gauge for example, the standard inlet pressure is 6–8 bar, while the operating outlet pressure is checked up to 350 bar for the M44 and 400 bar for the M46. Pump flow at 1,500 RPM is measured between 150–165 liters per minute. The **input shaft torque** is evaluated with a torque meter up to 450–500 Nm to ensure proper power transmission.

In the second stage, internal components including the cylinder block, pistons, and swash plate are inspected with precision tools such as digital micrometers and wear gauges. The **maximum allowable deviation for piston diameter and cylinder bore is 0.02 mm**, and any component beyond this tolerance is replaced. O-rings and seals are replaced according to operating pressures of 350–400 bar and flow rates of 150–165 L/min. The drive shaft is tested for torque resistance and wear to ensure stable operation and prevent abnormal vibrations.

The final stage involves pump assembly and **numerical perfor

Samand roller bearing

The idler bearing for the Samand is a key component in the vehicle’s timing system, responsible for precisely guiding the timing belt and maintaining consistent tension during engine operation. This part is made from heat-treated alloy steel to ensure high resistance to dynamic pressure and elevated temperatures caused by the continuous rotation of the belt. Its design minimizes friction and enables smooth movement, preventing vibrations and abnormal noises in the system. Using this type of idler bearing in the Samand enhances the lifespan of the timing belt and reduces the risk of sudden engine failures.

From a technical standpoint, the Samand idler bearing features a sealed structure and permanent lubrication that protects it from dust, moisture, and environmental contaminants, eliminating the need for frequent maintenance. The internal balls and cage are precisely engineered to absorb intense rotational forces and sudden impacts efficiently. This bearing is dimensionally compatible with common Samand engines such as the XU7 and EF7, ensuring smooth and accurate performance under various driving conditions. These qualities make the Samand idler bearing a reliable and cost-effective choice for maintaining the optimal function of the timing system.

FAG spherical roller bearing

FAG spherical roller bearings are produced using one row of roller in axial type and usually with two rows of rollers for radial type of spherical bearing. FAG which is one of the major German producers of all types of bearings produced spherical roller bearings according to DIN standard and with high abrasion resistance of over 60 Rockwell. high tensile strength of FAG spherical roller bearings provide high resistance against the applied tensions and lead to higher durability. Using specific grease of usually Lithium and Calcium base for lubrication is another specification of FAG spherical roller bearings.

Cylindrical roller bearing

Cylindrical roller bearings are produced in both thrust and radial shapes. needle bearings are in fact a type of cylindrical roller bearing that have very thin rollers. cylindrical roller bearings have more contact and touch with the rings compared to ball bearings and in this respect can suspend higher loads. Cylindrical roller bearings are available in various brands including SKF, NACHI, KOYO and Timken

Road roller Brake

road roller brake