Named Alongside Excavators and Cranes as a Sauer Danfoss Construction Application

Refurbished Sauer Danfoss Bulldozer Hydraulic Pumps

Name: Refurbished Sauer Danfoss Bulldozer Hydraulic Pump
Brand: Sauer Danfoss
Availability: InStock

Bulldozers are directly named alongside excavators and cranes as core construction machinery applications for Sauer Danfoss piston pumps — typically powering the track drive (hydrostatic propulsion) circuit, a closed-loop system giving stepless track speed control without a mechanical transmission. PumpGrid refurbishes the Series 90 track drive pump to original tolerances, tested before dispatch.

Series 90 Track Drive Pump Closed-Circuit Hydrostatic 3-Month Warranty Pan India Supply

A bulldozer's track drive pump is a closed-circuit system, separate from the blade lift/tilt circuit — Sauer Danfoss Series 90 units commonly fill this role, giving stepless, precise track speed control on each side independently, which is what lets an operator steer by varying track speed rather than a mechanical clutch-and-brake system. This is the same closed-circuit architecture Sauer Danfoss uses across excavator travel drives and crane track propulsion.

Two Systems on Your Dozer

SystemTypical PumpFunction

Track Drive (Propulsion)Sauer Danfoss Series 90 closed-circuitIndependent left/right track speed control

Blade Lift/Tilt/AngleSeparate open-circuit pumpBlade positioning — see our general Bulldozer page

Refurbished Sauer Danfoss Series 90 Bulldozer Track Drive Pump

Sauer Danfoss Series 90 closed-circuit pump — refurbished for bulldozer track drive duty

What Our Refurbishment Covers

Piston & Slipper Assembly

Measured against Sauer Danfoss tolerance for the closed-circuit design.

Integral Charge Pump

Inspected and rebuilt — critical for reliable closed-circuit operation.

Swashplate Control Response

Tested for smooth, precise, independent track speed control — essential for accurate steering.

Closed-Loop Bench Test

Verified in a closed-circuit rig, confirming charge pressure and output before dispatch.

Why Bulldozer Owners Choose PumpGrid

Correct Diagnosis First

We help confirm track drive vs blade circuit before you order.

40-60% Savings vs New Import

Refurbishment saves significantly against new import pricing.

Documented Test Results

Written test report with actual charge pressure and output readings.

3-Month Warranty

Replacement, not repair, if a refurbishment defect appears within warranty.

Warning Signs

Dozer drifts or steers unevenly while travelling

Weak or jerky track speed response

Whining noise specifically during travel

Oil leak near the charge pump section

We Supply Across India

Delhi NCR Nagpur Bhubaneswar

FAQs

Why does my dozer steer by pulling one track slower instead of a wheel?

This is the normal operating principle for a track drive dozer with independent left/right closed-circuit pumps — the operator steers by varying relative track speed, not with a steering wheel. If steering feels imprecise or one side consistently underperforms, that points to a specific pump issue.

My dozer's blade works fine but travel is weak — is that this pump?

Yes, likely — since blade lift/tilt typically runs off a separate open-circuit pump, normal blade function with weak travel points toward the Series 90 track drive pump specifically. WhatsApp your symptoms and we'll help confirm.