6Y8764 Pump for CAT 120H, 120H ES, 120H NA & more

The 6Y8764 pump is a hydraulic gear pump that pressurizes and circulates hydraulic fluid throughout the machine’s hydraulic system. It converts mechanical power from the engine into hydraulic energy, which powers steering, blade controls, lift circuits, and other fluid‑driven functions.

Here’s a general guide for proper installation:

1. Turn off the engine and safely relieve all hydraulic pressure before beginning work.
2. Locate and disconnect the hydraulic lines and mounting bolts from the old pump.
3. Carefully remove the old pump assembly, taking care not to spill fluid.
4. Clean the mounting surface and inspect the ports and fittings for wear or damage.
5. Install the new 6Y8764 pump, align it with the mounting holes, and torque fasteners to the specifications in your service manual.
6. Reconnect hydraulic lines, refill the reservoir with the correct hydraulic fluid, and bleed air from the system as required.
7. Start the engine and check for proper operation and leaks.

The 6Y8764 pump fits many Caterpillar motor graders and heavy machines, including models such as 120H, 12H, 140H, 135H, 160H, 143H, 120K, 12K, 160K, 163H, and others where this part number is specified. It also fits various engine platform applications including models powered by 3116, 3126, 3126B, 3176C, 3306, C‑9, and C7. Please reach out to Propel Parts for help verifying fitment.

Yes, the 6Y8764 pump is manufactured to meet or exceed OEM specifications for durability and performance. Aftermarket units are quality‑checked to ensure they match the fit and function of the original Caterpillar part, helping to deliver reliable hydraulic pressure and consistent flow under typical operating conditions.

Hydraulic pumps should be checked during routine hydraulic system maintenance or when your machine shows signs of declining performance. Inspect for unusual noise, fluid leaks, slow or inconsistent actuator motion, or overheating. Replace the pump if it fails to maintain proper pressure or if wear is evident.

Typical indicators include:

1. Reduced hydraulic performance (slow lift or steering response)
2. Unusual whining or grinding noises from the pump area
3. Visible hydraulic fluid leaks around the pump or fittings
4. Overheating of the hydraulic system

A quality hydraulic pump like the 6Y8764 ensures consistent fluid delivery and pressure to all hydraulic circuits. Using a pump that meets or exceeds OEM standards improves reliability, reduces the risk of system failures, and contributes to long‑term equipment uptime and performance, especially in heavy‑duty applications.