08-11-2025, 08:35 PM
Overview of the Skat Trak 1700C Hydraulic Drive System
The Skat Trak 1700C skid steer, though not widely supported today, remains in use among small contractors and landowners due to its compact footprint and mechanical simplicity. Its drive system relies on a tandem hydraulic pump setup—typically sourced from well-known manufacturers like Sauer-Danfoss or Eaton—that powers the left and right drive motors independently. When one of these pumps fails, the machine loses mobility on one side, rendering it inoperable.
In the case of the 1700C, a common failure point is the coupler and shaft interface between the pump and the engine. Over time, the splines or teeth on these components wear down, leading to slippage, loss of torque transmission, and eventual pump disengagement.
Terminology Clarification
- Hydraulic Pump: A mechanical device that converts engine power into hydraulic energy to drive motors and actuators.
- Coupler: A mechanical connector that joins the pump shaft to the engine or motor, often using splines or keyed interfaces.
- Spline Wear: Erosion or rounding of the gear-like teeth on a shaft or coupler, reducing engagement strength.
- Tandem Pump: A dual-section hydraulic pump that powers two independent circuits, such as left and right drive motors.
Failure Symptoms and Initial Diagnosis
In one documented case, the machine operated reliably for three years before the drive pump failed. Upon inspection by a diesel mechanic, the following issues were identified:
Repair Options and Cost Considerations
The owner’s budget was approximately $1,500, which is sufficient for several repair paths depending on part availability and labor costs:
While exact specs vary by pump model, typical values include:
In Milwaukee, a technician faced a similar issue with a Skat Trak 1700C. Rather than replacing the pump, he measured the worn shaft and fabricated a new coupler using hardened steel and a CNC mill. The custom part restored full engagement, and the machine was back in service within days. The total cost was under $800, including labor and materials.
Sourcing Tips and Aftermarket Support
Because Skat Trak is no longer active in the skid steer market, parts must be sourced creatively:
To extend the life of the coupler and pump interface:
Coupler wear is a common issue in compact machines where high torque is transmitted through small interfaces. Manufacturers now use tapered spline designs and cushioned couplers to reduce shock loads. In older machines like the 1700C, rigid couplers without damping are more prone to wear—especially if lubrication is neglected or alignment is off.
Conclusion: Mechanical Ingenuity Keeps Legacy Machines Alive
The Skat Trak 1700C may be a discontinued model, but its hydraulic system is built on standard components that can be repaired or replaced with the right approach. Whether through coupler fabrication, pump rebuilding, or creative sourcing, restoring drive function is achievable within a modest budget. In the world of heavy equipment, legacy machines survive not just on parts—but on the persistence and ingenuity of those who keep them running.
The Skat Trak 1700C skid steer, though not widely supported today, remains in use among small contractors and landowners due to its compact footprint and mechanical simplicity. Its drive system relies on a tandem hydraulic pump setup—typically sourced from well-known manufacturers like Sauer-Danfoss or Eaton—that powers the left and right drive motors independently. When one of these pumps fails, the machine loses mobility on one side, rendering it inoperable.
In the case of the 1700C, a common failure point is the coupler and shaft interface between the pump and the engine. Over time, the splines or teeth on these components wear down, leading to slippage, loss of torque transmission, and eventual pump disengagement.
Terminology Clarification
- Hydraulic Pump: A mechanical device that converts engine power into hydraulic energy to drive motors and actuators.
- Coupler: A mechanical connector that joins the pump shaft to the engine or motor, often using splines or keyed interfaces.
- Spline Wear: Erosion or rounding of the gear-like teeth on a shaft or coupler, reducing engagement strength.
- Tandem Pump: A dual-section hydraulic pump that powers two independent circuits, such as left and right drive motors.
Failure Symptoms and Initial Diagnosis
In one documented case, the machine operated reliably for three years before the drive pump failed. Upon inspection by a diesel mechanic, the following issues were identified:
- Severely worn teeth on the coupler and pump shaft
- Inability to transmit torque from the engine to the hydraulic pump
- No visible damage to the pump housing or internal components
- Machine had been idle for over a year due to part sourcing difficulties
Repair Options and Cost Considerations
The owner’s budget was approximately $1,500, which is sufficient for several repair paths depending on part availability and labor costs:
- Replace the entire hydraulic pump with a refurbished or used unit
- Rebuild the pump using a new shaft and coupler if internal components are intact
- Fabricate a custom coupler to restore engagement without full pump replacement
- Source parts from hydraulic specialists or salvage yards familiar with Sauer-Danfoss configurations
While exact specs vary by pump model, typical values include:
- Coupler spline count: 13–15 teeth (SAE standard)
- Shaft diameter: 1.25–1.5 inches
- Pump displacement: 25–35 cc/rev per section
- Operating pressure: 2,500–3,000 psi
- Mounting flange: SAE A or B pattern
In Milwaukee, a technician faced a similar issue with a Skat Trak 1700C. Rather than replacing the pump, he measured the worn shaft and fabricated a new coupler using hardened steel and a CNC mill. The custom part restored full engagement, and the machine was back in service within days. The total cost was under $800, including labor and materials.
Sourcing Tips and Aftermarket Support
Because Skat Trak is no longer active in the skid steer market, parts must be sourced creatively:
- Identify the pump manufacturer and model number from the tag or casting
- Contact hydraulic rebuild shops that specialize in Sauer-Danfoss or Eaton pumps
- Use online platforms like Loader Parts Source or surplus equipment dealers
- Search by pump dimensions and spline specs rather than brand name
- Consider donor machines with compatible hydraulic systems
To extend the life of the coupler and pump interface:
- Inspect coupler teeth annually for signs of wear or misalignment
- Use anti-seize compound on splines during installation
- Ensure proper shaft alignment to prevent side loading
- Replace worn engine mounts that may cause vibration or misalignment
- Avoid aggressive starts and stops that stress the drive interface
Coupler wear is a common issue in compact machines where high torque is transmitted through small interfaces. Manufacturers now use tapered spline designs and cushioned couplers to reduce shock loads. In older machines like the 1700C, rigid couplers without damping are more prone to wear—especially if lubrication is neglected or alignment is off.
Conclusion: Mechanical Ingenuity Keeps Legacy Machines Alive
The Skat Trak 1700C may be a discontinued model, but its hydraulic system is built on standard components that can be repaired or replaced with the right approach. Whether through coupler fabrication, pump rebuilding, or creative sourcing, restoring drive function is achievable within a modest budget. In the world of heavy equipment, legacy machines survive not just on parts—but on the persistence and ingenuity of those who keep them running.
