373-6629 Cat D10T2 Hydraulic Main Pump 350Bar

Product Overview

The 373-6629 is the hydraulic main pump (piston pump) serving the implement hydraulic system of the Caterpillar D10T2 track-type tractor, a large bulldozer. Machined to the interface dimensions and mounting datum of the original CAT D10T2 pump group, it is offered as an interchangeable replacement for the original 373-6629 pump assembly and installs without modifying lines or brackets. Aftermarket sources also list fitment for D10R, D10T, D10T2 SU, and D10T2 WH.

The D10T2 implement hydraulic system uses a variable-displacement piston pump to deliver high-pressure flow for the bulldozer, tilt cylinder, ripper (lift and pitch), and steering. Our positioning centers on high-pressure hydraulic manufacturing, original-position interchangeability, and 100% simulated operating-condition testing before shipment, with the goal of reducing field failures and machine downtime.

Technical Specifications

• Model: 373-6629 (cross-reference 20R-9389 reman; related implement pump 373-6630)

• Product type: Hydraulic piston pump / main pump

• Applicable machine: Caterpillar D10T2 track-type tractor (bulldozer); aftermarket channels also list D10R, D10T, D10T2 SU, D10T2 WH

• Pump type: Variable-displacement piston (per D10T2 machine hydraulic specification)

• System relief valve setting (machine level, verified): bulldozer and ripper lift 4061 psi (28000 kPa); tilt cylinder 2944 psi (20300 kPa)

• Combined implement pump output (machine level, verified): 380 L/min (100.4 gal/min) at 1800 rpm engine speed

• Hydraulic tank capacity (machine level, verified): 131 L (34.6 gal US)

• Engine: Cat C27 ACERT, rated speed 1800 rpm

• Displacement: Not confirmed in official documentation

• Rated pressure: Not confirmed in official documentation (see system relief setting above)

• Peak pressure: Not confirmed in official documentation

• Maximum speed: Not confirmed in official documentation

• Control method: Not confirmed in official documentation

• Rotation: Not confirmed in official documentation

• Weight: Not confirmed in official documentation

• Mounting / shaft / ports: Not confirmed in official documentation (varies by machine serial number and hydraulic configuration; confirm before ordering)

Key Technical Advantages

• Original-position interchangeability: Machined to the CAT D10T2 pump group interface and mounting datum, it directly replaces the original 373-6629 assembly, saving re-piping and bracket modification labor.

• 100% simulated operating-condition testing: Every pump is bench-tested under high pressure before shipment to verify flow, pressure, and leakage, lowering early-field-failure risk.

• Precision machining and cleanliness control: Critical friction pairs such as cylinder block, piston, and valve plate are machined to tight tolerances and assembled under controlled cleanliness, suppressing particle-induced wear.

• Volumetric efficiency and flow stability: The piston design holds stable volumetric efficiency and flow under high load, supporting synchronized dozer, ripper, and steering actions.

• Wear-resistant friction pairs: Durable piston and slipper components extend overhaul intervals under continuous mining and heavy-duty operation.

Application Areas

• Caterpillar D10T2 / D10T / D10R large track-type dozers

• Mine stripping, heavy dozing, and ripping

• Large earthmoving, dam, and roadbed construction

• Forestry clearing and land reclamation in severe conditions

• Fleet maintenance and on-site spare parts stock

Expert Maintenance Tips

• Oil cleanliness: Keep the system at ISO 4406 18/16/13 or better. The D10T2 hydraulic tank holds about 131 L; replace filters on schedule to protect the piston pump from early wear.

• Serial number check: Before installation, supply the machine serial number and photos of the old part to confirm 373-6629 matches the specific hydraulic configuration (prefixes such as JJW or RAB) and avoid year-to-year port or mounting differences.

• Priming and bleeding: Fully fill and bleed the pump case and suction line before first start; never run dry.

• Case drain and back pressure: Verify the case drain line is clear and back pressure stays within limits to avoid shaft-seal damage from trapped pressure.

• Torque and alignment: Tighten mounting bolts and coupling to specified torque and keep the pump shaft aligned with the drive shaft to prevent bearing side load and abnormal noise.

• Commissioning check: After the first duty cycle, re-check for leakage, noise, and case temperature; stop and inspect if anything is abnormal.

• Related part: When servicing the implement system together, verify fitment of 373-6630 (D10T-series implement pump, group 359-6447).