Hydraulic Main Pump Assembly for CAT 336D 336DL Excavator Part No.322-8733

Main hydraulic pump assembly for the CAT 336 excavator family. It delivers pressurized oil to the implement and travel circuits through a variable-displacement axial piston design. The assembly includes the main pump body and regulator valve group.

Compatibility must be confirmed by the pump nameplate part number, old-pump photos, spline size, and regulator type before ordering.

• Variable displacement axial piston pump, designed for excavator main-hydraulic duty.
• Complete assembly supplied with pressure and flow regulator valves; ready for installation after connecting hydraulic lines.
• Flange-mounted drive interface to the engine flywheel housing.
• Remanufactured option: disassembled, cleaned, seals and wear parts replaced where applicable, matched and bench-tested. Please confirm the exact reconditioning steps performed for your order.
• New aftermarket option: manufactured to the same mounting and interface dimensions as the referenced original part; confirm interchangeability by part number.
• Oil-sealed and anti-rust packed before shipment; nameplate and test photos available on request.

The models and part numbers below are cross-reference data collected from the parts market for buyer matching. They are not a guarantee of direct fitment. Final compatibility depends on the exact part number and suffix on the pump nameplate, the regulator type (hydraulic vs. electronic), the flange bolt pattern, and the spline.

• ① Nameplate photo — clearly showing the part number and suffix.
• ② Old pump part number — as marked on the original unit.
• ③ Photos of the old pump — side view and mounting flange view.

We will confirm the matching part before shipping.