Main Hydraulic Pumps for Excavators | Imara Engineering Skip to content

Questions about installation or compatibility? Call us: +61 405 244 342 / 1300 974 961 | USA/CANADA: +1 213 289 0578
Email: admin@imaraengineering.net | Fast International Shipping Worldwide

Main Hydraulic Pumps for Excavators: OEM-Quality Main Pump Replacements for Komatsu, CAT, Hitachi & More

The main hydraulic pump is the single most critical component within your excavator's hydraulic parts system. It is the primary pressure source that generates the high-volume hydraulic flow powering every working function on your machine simultaneously, from boom and arm movement to bucket curl, swing, and travel. At Imara Engineering Supplies, we supply OEM-quality main hydraulic pump assemblies cross-referenced to your exact machine model and serial number.

Imara Engineering keeps high-demand main pump assemblies in ready stock so that when your machine goes down, you are not waiting weeks for an overseas shipment. We dispatch promptly internationally, with our parts specialists on hand to confirm the exact correct unit for your machine before your order is placed.

Compare (0/5)

182 products

Hydraulic Pump 705-12-36010 for Komatsu GD805A-1 Motor Grader

Hydraulic Pump 705-12-36010 for Komatsu GD805A-1 Motor Grader

Regular price $708.00
Sale price $708.00 Regular price
Hydraulic Pump 289-6370 for CAT 432E 434E 442E 444E Backhoe Loader

Hydraulic Pump 289-6370 2896370 for CAT 432E 434E 442E 444E Backhoe Loader

Regular price $2,106.00
Sale price $2,106.00 Regular price
Hydraulic Pump 289-6370 for CAT 432E 434E Backhoe Loader

Hydraulic Pump 289-6370 2896370 for CAT 432E 434E 442E 444E Backhoe Loader

Regular price $1,926.00
Sale price $1,926.00 Regular price
Hydraulic Pump Cartridge 4T-1893 4T1893 for CAT 950B 950E 963 Wheel Loader

Hydraulic Pump Cartridge 4T-1893 4T1893 for CAT 950B 950E 963 Wheel Loader

Regular price $154.00
Sale price $154.00 Regular price
Hydraulic Pump Plate 1U-3508 1U3508 for CAT 446D 918F 924F Wheel Loader

Hydraulic Pump Plate 1U-3508 1U3508 for CAT 446D 918F 924F Wheel Loader

Regular price $85.00
Sale price $85.00 Regular price
Hydraulic Pump 370-7601 for CAT 986H Wheel Loader

Hydraulic Pump 370-7601 3707601 for CAT 986H Wheel Loader

Regular price $1,787.00
Sale price $1,787.00 Regular price
Hydraulic Pump VOE11881939 for Volvo BL60 BL61 Backhoe Loader

Hydraulic Pump VOE11881939 11881939 for Volvo BL60 BL60B BL61 BL61B Backhoe Loader

Regular price $740.00
Sale price $740.00 Regular price
Hydraulic Pump 121-4312 for CAT 24H Motor Grader

Hydraulic Pump 121-4312 (0R-7686) for CAT 24H Motor Grader

Regular price $2,559.00
Sale price $2,559.00 Regular price
Hydraulic Pump 370-9197 for CAT 24M Motor Grader

Hydraulic Pump 370-9197 3709197 for CAT 24M Motor Grader

Regular price $2,498.00
Sale price $2,498.00 Regular price
Hydraulic Pump 9T-1211 for CAT 446 446B Backhoe Loader

Hydraulic Pump 9T-1211 9T1211 for CAT 446 446B Backhoe Loader

Regular price $2,354.00
Sale price $2,354.00 Regular price
Hydraulic Pump 124-3027 for CAT 12G 140G 160G Motor Grader

Hydraulic Pump 124-3027 (0R-7666) for CAT 12G 140G 160G Motor Grader

Regular price $2,336.00
Sale price $2,336.00 Regular price
Hydraulic Pump 4T-1029 for CAT D8L Bulldozer

Hydraulic Pump 4T-1029 4T1029 for CAT D8L Bulldozer

Regular price $1,977.00
Sale price $1,977.00 Regular price
Hydraulic Pump 232-1835 for CAT D10R 769D 770 Truck

Hydraulic Pump 232-1835 (10R-9089) for CAT D10R 769D 770 Truck

Regular price $2,049.00
Sale price $2,049.00 Regular price
Hydraulic Main Pump 224-4430 for CAT 725 730 ADT

Hydraulic Main Pump 224-4430 (10R-6686) for CAT 725 730 Articulated Dump Truck

Regular price $1,222.00
Sale price $1,222.00 Regular price
Hydraulic Main Pump 240-2647 for CAT Articulated Dump Truck

Hydraulic Main Pump 240-2647 (10R-6688) for CAT 725 725C 725C2 Articulated Dump Truck

Regular price $1,366.00
Sale price $1,366.00 Regular price
Piston Hydraulic Pump 169-4882 for CAT Motor Grader

Piston Hydraulic Pump 169-4882 1694882 for CAT 12H 120H 135H Motor Grader

Regular price $2,839.00
Sale price $2,839.00 Regular price
Hydraulic Pump 235-4108 for CAT Backhoe Loader

Hydraulic Pump 235-4108 2354108 for CAT 416D 424D Backhoe Loader

Regular price $1,761.00
Sale price $1,761.00 Regular price
Hydraulic Pump VOE12735909 for Volvo Motor Grader

Hydraulic Pump VOE12735909 12735909 for Volvo G900 G900B G900C Motor Grader

Regular price $2,926.00
Sale price $2,926.00 Regular price
Hydraulic Pump VOE14531855 for Volvo Excavator

Hydraulic Pump VOE14531855 14531855 for Volvo EC210B EC210C Excavators

Regular price $5,606.00
Sale price $5,606.00 Regular price

Collection: Main Hydraulic Pump

What Does the Main Hydraulic Pump Do?

The main hydraulic pump is driven directly off the excavator's engine via a drive coupling at the rear of the engine or through a power take-off (PTO) arrangement. As the engine runs, the pump converts that rotational mechanical energy into pressurised hydraulic fluid flow, which is then directed by the main control valve to whichever functions the operator is commanding. On modern excavators, the main pump is typically a variable-displacement axial piston pump, meaning it can modulate its output flow based on the load demand of the machine at any given moment, optimising both performance and fuel consumption across different working conditions.

Most excavators use a tandem pump arrangement, combining two main pump sections often alongside a pilot pump into a single compact assembly mounted directly at the engine. This tandem configuration allows the machine to supply independent hydraulic circuits simultaneously, enabling combined movements such as boom-up and swing at the same time without sacrificing pressure in either circuit.

Common Symptoms of Main Hydraulic Pump Failure

Identifying main pump degradation early prevents costly secondary damage to the rest of your hydraulic system. Look out for these warning signs:

  1. Loss of digging force or breakout power — The most common early symptom; the pump can no longer maintain full system pressure under load.
  2. Slow boom, arm, or bucket movement — Reduced flow from a worn pump results in sluggish attachment response even at full throttle.
  3. All functions are affected simultaneously — Because the main pump supplies the entire system, degradation impacts every function at once, unlike a valve or cylinder fault, which typically affects one circuit.
  4. Overheating hydraulic oil — A worn pump works harder to maintain pressure, generating excess heat across the entire circuit.
  5. Whining or knocking noise from the pump bay — Internal wear or cavitation produces audible noise during operation.
  6. Milky or contaminated hydraulic fluid — Water ingress or internal seal failure contaminates fluid, accelerating wear across the whole system.

If you are experiencing any combination of these symptoms, the main pump should be inspected and pressure-tested immediately before further operation causes damage to motors, cylinders, and valves downstream.

Main Hydraulic Pump Models We Supply

Imara Engineering supplies main hydraulic pump assemblies for a wide range of excavator models and production series. Our most commonly supplied models include:

  • Komatsu — PC200-7, PC200-8, PC210, PC300-7, PC300-8, PC360, PC400-7, PC400-8
  • Caterpillar (CAT) — 320C, 320D, 320D2, 323, 325, 330C, 330D, 336
  • Hitachi — ZX200-3, ZX210-3, ZX300-3, ZX330-3, ZX450-3, EX200, EX300
  • Volvo — EC210B, EC240B, EC290B, EC380, EC480
  • Doosan — DX225LC, DX300LC, DX380LC
  • Kobelco — SK200-8, SK300, SK350-8, SK480
  • Hyundai — R210LC, R290LC, R380LC
  • Case — CX210, CX300, CX350

Don't see your model listed? Contact our parts team with your machine serial number and OEM part number. We will source and confirm the correct main pump assembly for your specific unit.

OEM vs Aftermarket Main Hydraulic Pumps: Understanding the Difference

Choosing between a genuine OEM pump and an aftermarket replacement is one of the most important decisions when rebuilding your excavator's hydraulic system. Here is what you need to know:

  • Genuine OEM pumps are manufactured by the original equipment maker or their authorised supplier. They carry the brand warranty and are guaranteed to fit, but they come at a significant price premium that is often difficult to justify for older machines or high-turnover fleet operations.
  • OEM-quality aftermarket pumps, like those supplied by Imara Engineering, are manufactured by third-party precision engineering facilities to the same specifications, same displacement ratings, port dimensions, shaft tolerances, and pressure limits as the original part. The difference is in branding and price, not in performance or durability.

For fleet managers and operators running machines beyond the OEM warranty period, an OEM-quality aftermarket main pump delivers equivalent service life at a fraction of the genuine part cost, making it the practical, commercially sound choice for the majority of excavator owners.

Related Hydraulic Parts You May Need

A main pump replacement or rebuild often requires additional components from the wider hydraulic parts system. Consider sourcing these alongside your main pump:

  • Pilot Pumps — Frequently replaced alongside the main pump in tandem assemblies
  • Pump Seal Kits — For main pump rebuilds and overhauls
  • Hydraulic Filters — Essential after any pump replacement to protect the new unit from contaminated fluid
  • Main Control Valves — Inspect alongside the main pump when experiencing full-system pressure loss
  • Hydraulic Hoses & Pipes — Check connecting hoses for wear when replacing the pump assembly

Frequently Asked Questions

Powering Your Projects with Premium Parts.
Your Trusted Source for Heavy Equipment Solutions.
Engineered for Excellence, Delivered on Time.