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Bosch Rexroth R986111478 (Series 52/53) is an OEM replacement for CAT 326-4178, delivering dependable hydraulic performance with direct compatibility and consistent output under load.
Technical Specifications
Flow Performance
With a 100 cc displacement, the R986111478 supports strong, repeatable flow delivery across operating speeds up to 2300 RPM. The fixed displacement profile helps maintain predictable actuator response and smooth system behavior under varying load conditions.
Efficiency & Durability
Rated for 3600 PSI nominal pressure with 4600 PSI peak capability, this unit is built to sustain performance in high-pressure duty cycles. Operation up to 2300 RPM supports stable output while maintaining durability in continuous-use hydraulic circuits.
Installation
Designed as a direct OEM replacement for CAT 326-4178, the R986111478 matches the intended fit and interface for straightforward installation. It is intended to install without modifications when replacing the original component.
Features and Benefits
- 100 cc displacement: Provides consistent, predictable flow per revolution for stable machine response and repeatable cycle performance.
- 3600 PSI nominal / 4600 PSI peak pressure rating: Supports continuous high-pressure operation with headroom for transient pressure spikes during demanding events.
- 2300 RPM maximum speed capability: Maintains required hydraulic output across a wide operating speed range for responsive performance during dynamic machine operation.
Operational Information
Engineered for reliable operation in high-pressure hydraulic systems up to 3600 PSI nominal and 4600 PSI peak, with rotational speeds up to 2300 RPM. For best reliability, operate within the system’s established fluid cleanliness and temperature controls.
Quality Assurance
Manufactured to Bosch Rexroth’s stringent quality standards with rigorous testing throughout the production process.
| Weight | 75.0 lbs |
|---|---|
| Dimensions | 20 × 20 × 15 in |
| Manufacturer | Bosch Rexroth |
| Pumps Max Pressure | 3600 PSI |
| Pumps Rated Speed | 2300 |
| Pumps Max Speed | 2300 |
| Pumps Displacement | 100cc |
| Pump Continuous Pressure | 3600 PSI |
| Pump Intermittent Pressure | 4600 PSI |
Purchasing Information
Availability & Delivery
Most Bosch Rexroth replacement parts ship within 1-3 business days. Custom or special-order items may require additional lead time.
For current availability on R986111478, call (800) 823-4937.
Warranty & Protection
- Standard Warranty: 18 months from date of shipment or 12 months from date placed in service, whichever occurs first
- Coverage: Defects in material and workmanship under normal operating conditions
- Remedy: Repair, replacement, or credit at seller’s option
- Conditions: Product must be used per manufacturer specifications and documentation
Ordering Options
Contact our sales team for pricing and availability. Volume discounts may be available for larger orders.
We accept purchase orders from established accounts. New customers may require prepayment or credit approval.
Support & Documentation
- Technical specifications and datasheets available upon request
- Cross-reference assistance for OEM part identification
- Application engineering support for system integration
- Returns accepted within 30 days in unused, original condition
Questions? Call our specialists: (800) 823-4937 | Monday-Friday, 7 AM – 5 PM MST
Product Selection Guide
Compare these Series 52/53 components primarily by displacement (flow per revolution), then confirm pressure rating and allowable speed match your system requirements. If you’re evaluating alternatives across similar piston pumps, keep the same duty cycle and control strategy in mind.
?? Important: The specifications shown are for reference and comparison purposes. Always verify specifications with the official manufacturer documentation or contact our technical team before ordering to ensure compatibility with your application.
| Part Number | Displacement | Pressure | Max Speed | Series |
|---|---|---|---|---|
| R986111478 | 100cc | 3600 PSI | 2300 | 52/53 |
| R986111102 | 74cc | 3600 PSI | 2600 | 52/53 |
| R986110043 | 45cc | 3600 PSI | 2600 | 52/53 |
| R986110100 | 71cc | 3600 PSI | 2600 | 52/53 |
| R986111581 | 60cc | 3600 PSI | 2600 | 52 |
Key Differences
Displacement
R986111478 is 100cc, while the comparison parts range from 45cc to 74cc; choose higher displacement when you need more flow at a given speed, and lower displacement when your required flow is lower or you need finer control at the same prime-mover speed.
Pressure Rating
All listed models show 3600 PSI nominal pressure; only R986111478 includes a stated 4600 PSI peak rating, so verify peak-pressure requirements if your system sees transient spikes.
Speed
R986111478 is rated to 2300 max speed, while the compared parts are listed at 2600; if your operating speed approaches these limits, select a model that meets or exceeds your maximum shaft speed.
Quick Selection Guide
Choose: R986111478
Because: When you need 100cc displacement with 3600 PSI nominal pressure, a stated 4600 PSI peak capability, and operation up to 2300 max speed in a Series 52/53 replacement.
Choose: Higher displacement model
Because: When your required displacement is higher than 100cc to achieve the needed flow at your available operating speed (none of the listed comparison parts exceed 100cc).
Choose: Lower pressure model
Because: When the system operates at lower pressures for cost savings (not applicable to the listed comparison parts, which are all shown at 3600 PSI nominal).
Compatibility: Verify mounting pattern, shaft configuration, and port sizes match your existing installation, and confirm Series 52/53 configuration and speed/pressure limits align with your duty cycle. If you’re sourcing other hydraulic pumps for the same machine family, keep rotation and control type consistent to avoid rework.
For application-specific guidance, contact our technical team.
Compatibility & Applications
Direct Replacement Information
This Rexroth R986111478 replaces CAT 326-4178 in high-pressure mobile hydraulic pump applications.
- Closed-loop or open-circuit hydraulic systems requiring 100cc displacement variable flow control
- Hydrostatic drive circuits operating at 3600 PSI nominal pressure
- Implement/work-function circuits where variable displacement supports load-sensing or pressure-compensated control (for related configurations, compare to R986111250)
- Mobile hydraulic systems with pump input speeds up to 2300 max RPM
Common Applications
This Bosch Rexroth R986111478 is commonly used in:
- construction equipment (excavators, loaders, dozers)
- mining equipment
- forestry machinery
- material handling equipment (similar duty cycles may also use R986111344 depending on displacement and control requirements)
Important: Verify mounting interface, shaft configuration, rotation, and porting match the existing CAT 326-4178 installation before ordering.
Bosch Rexroth R986111478 Axial Piston Variable Pump | Replaces CAT 326-4178 | 100cc | 3600 PSI
$5,289.00
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No sales tax
Expected delivery Oct 14 - Oct 20
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