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Bosch Rexroth R986111185 (Series 52/53) is a direct OEM replacement for CAT 366-4955, built to deliver reliable hydraulic performance with OEM-fit compatibility.
Technical Specifications
Flow Performance
With a 71 cc displacement, the R986111185 provides consistent volumetric output for predictable actuator response and smooth machine control. Its displacement supports stable flow delivery across operating speeds up to 2600 RPM, helping maintain repeatable performance under varying load conditions.
Efficiency & Durability
Rated for 3600 PSI nominal pressure with 4600 PSI peak capability, this component is designed to sustain performance under demanding pressure cycles. Operation up to 2600 RPM supports high-duty hydraulic use while maintaining stable output characteristics within the specified operating limits.
Installation
Designed as an OEM replacement for CAT 366-4955, the R986111185 installs as a direct fit with no modifications required. Mounting and interface compatibility align with the intended OEM configuration for straightforward changeout.
Features and Benefits
- 71 cc displacement: Delivers consistent hydraulic output per revolution for predictable machine response and controllable flow characteristics.
- 3600 PSI nominal / 4600 PSI peak pressure rating: Supports continuous high-pressure operation with headroom for peak load events within the specified limits.
- 2600 RPM maximum speed capability: Maintains stable performance at higher operating speeds to support fast cycle times and responsive hydraulic control.
Operational Information
Operate within the specified 3600 PSI nominal and 4600 PSI peak pressure limits and up to 2600 RPM maximum speed for consistent performance. The 48.5 weight and Series 52/53 design support reliable operation in demanding hydraulic duty cycles when maintained to standard hydraulic cleanliness and operating practices.
Quality Assurance
Manufactured to Bosch Rexroth’s stringent quality standards with rigorous testing throughout the production process.
| Weight | 48.5 lbs |
|---|---|
| Dimensions | 15 × 15 × 15 in |
| Manufacturer | Bosch Rexroth |
| Pumps Max Pressure | 3600 PSI |
| Pumps Rated Speed | 2600 |
| Pumps Max Speed | 2600 |
| Pumps Displacement | 71cc |
| 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 R986111185, 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
Compatibility & Applications
Direct Replacement Information
This Rexroth R986111185 replaces CAT 366-4955 in closed-loop and open-circuit hydrostatic drive applications.
- Hydrostatic drive systems requiring 71cc displacement variable-flow control (see our piston pumps selection for related options)
- Circuits operating at 3600 PSI nominal pressure with load-sensing or pressure-compensated control
- High-speed pump applications up to 2600 RPM in mobile hydraulic power and propel circuits
Common Applications
This Bosch Rexroth R986111185 is commonly used in:
- mining equipment
- construction and earthmoving machinery
- forestry machinery
- material handling equipment
- heavy-duty mobile vehicles
Important: Verify mounting interface, shaft configuration, control type, and port locations match the existing CAT 366-4955 installation and hydraulic circuit (open vs. closed loop).
Product Selection Guide
These Series 52/53 components share the same nominal pressure class, so selection is primarily driven by displacement (flow) needs and any speed differences among the options. If you are comparing across a broader range of hydraulic pumps, confirm control type and circuit requirements (open vs. closed loop) before selecting.
?? 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 |
|---|---|---|---|---|
| R986111185 | 71cc | 3600 PSI | 2600 | 52/53 |
| R986110077 | 45cc | 3600 PSI | 2600 | 52/53 |
| R986110609 | 71cc | 3600 PSI | 2600 | 52/53 |
| R986110062 | 71cc | 3600 PSI | 2600 | 52/53 |
| R986111159 | 100cc | 3600 PSI | 2300 | 52/53 |
Key Differences
Displacement
R986111185 is 71cc; choose 45cc (R986110077) when you need lower flow, stay with 71cc options (R986110609 or R986110062) when matching existing 71cc displacement is critical, and move to 100cc (R986111159) when higher flow is required.
Pressure Rating
All listed comparison models show 3600 PSI nominal pressure, aligning with R986111185’s 3600 PSI nominal rating; confirm your system also accounts for R986111185’s 4600 PSI peak requirement where applicable.
Speed
Most options list 2600 max speed (including R986111185), while the 100cc model (R986111159) lists 2300, which may matter if your application requires higher operating speed capability.
Quick Selection Guide
Choose: R986111185
Because: When you need a Series 52/53 71cc unit with 3600 PSI nominal pressure, 4600 PSI peak pressure capability, and up to 2600 max speed.
Choose: Higher displacement model
Because: Choose R986111159 (100cc) when your required flow exceeds what a 71cc unit can provide, and your operating speed requirement fits within its 2300 max speed.
Choose: Lower displacement model
Because: Choose R986110077 (45cc) when you need reduced displacement/flow while maintaining the same 3600 PSI nominal pressure class and up to 2600 max speed.
Compatibility: Verify mounting pattern, shaft configuration, and port sizes match your existing installation, and confirm displacement, pressure (nominal/peak), and max speed align with your system requirements. For nearby alternatives in this family, you may also compare against R986111250 when reviewing similar Rexroth axial piston pump configurations.
For application-specific guidance, contact our technical team.
Bosch Rexroth R986111185 Axial Piston Variable Pump | Replaces CAT 366-4955 | 71cc | 3600 PSI
$4,100.00
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Expected delivery Oct 13 - Oct 19
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