74318-DBM 74318-DAR Eaton Vickers Motor 40.6cc 350Bar

Model Number	74318DDAA, 74318-DDA, 74318-DAR, 74318DAR, 74318-DBM

Product Description

Product Overview

The 74318-DBM, 74318-DAR, 74318-DDA, and 74318DDAA belong to the Eaton Vickers 743XX Series of medium-duty fixed displacement axial piston motors, now supported under the Danfoss Power Solutions product portfolio. Featuring valve plate design with 40.6 cm³/rev displacement, the series is engineered for medium-duty hydraulic drive systems. Distinguished by compact construction, high power density, and wide speed range, the 743XX Series features SAE-B 2-bolt mounting flanges with multiple shaft and port configuration options, widely applicable in mobile machinery, agricultural equipment, and material handling hydraulic travel drive systems.

Note: The “74348” in the original title is a variant specification within the same series sharing the 40.6 cm³/rev displacement but with different mounting/port configurations. The “74315” is the 32.9 cm³/rev small displacement specification; the “74328” is the 49.2 cm³/rev large displacement specification. The “74318DDAA” is presumed to be a variant notation of 74318-DDAA, a specific configuration within the 74318 displacement class. Manufactured to original Eaton Vickers 743XX Series technical specifications with full drop-in interchangeability — no mounting flange or port connection modifications required.

Model Code Interpretation:

74318-DBM: 74318 pump size (40.6 cm³/rev), DBM as shaft, port, and backplate configuration code. Fits harvesters, sprayers, bark removers, and log skidders.
74318-DAR: 74318 displacement, DAR as specific configuration code (Danfoss model code AAJAEAB00000A0B), main ports 1.0625-12 UN-2B SAE O-ring side, drain ports top and bottom, SAE-B 2-bolt mounting flange.
74318-DDA: 74318 displacement, DDA as specific configuration code (Danfoss model code AAJABCA00000A0B), 15-tooth 16/32 spline shaft with 46 mm extension, main ports 1.3125-12 UN-2B SAE rear.

Technical Specifications

Series 743XX General Specifications (74318/74348):

Series: Eaton Vickers 743XX Series (Danfoss 743 Series)
Design: Valve plate fixed displacement axial piston motor, closed/open circuit compatible
Displacement: 40.6 cm³/rev (74318/74348); 32.9 cm³/rev (74315); 49.2 cm³/rev (74328)
Rated Pressure (Continuous): 350 bar (5076 psi) — 74318/74348/74315
Peak Pressure (<1s): 370 bar (5400 psi) — 74318/74348/74315
Rated Pressure (74328): 315 bar (4570 psi); Peak 345 bar (5000 psi)
Maximum Speed: 3,600 rpm (74318/74348/74315); 3,000 rpm (74328)
Input Flow at Rated Speed: 175.71 L/min (38.65 GPM) — 74318/74348; 142.43 L/min (31.33 GPM) — 74315
Output Power at Rated Speed & Pressure: 85.30 kW (114.50 hp) — 74318/74348; 69.13 kW (92.80 hp) — 74315; 77.53 kW (104.61 hp) — 74328
Output Torque at Rated Speed & Pressure: 226.27 N·m (2004.54 lbf·in) — 74318/74348; 183.36 N·m (1624.64 lbf·in) — 74315; 246.78 N·m (2197.68 lbf·in) — 74328
Maximum Working Pressure: 5076 psi (350 bar)
Maximum Flow: 40.6 gpm (74318/74348)
Maximum Output HP: 58 hp (74318-DAB)
Maximum Output Torque: 2005 in·lb (74318-DHP)
Mounting Flange: SAE-B 2-bolt flange
Shaft Type: 15-tooth or 13-tooth 16/32 spline (by configuration)
Main Ports: SAE O-ring ports (1.0625-12 or 1.3125-12 UN-2B, by configuration)
Drain Port: 0.750-16 UNF-2B SAE O-ring port
Continuous Case Pressure: 1.7 bar (25 psi)
Continuous Inlet Temperature: 107°C (225°F)
Weight (Single Motor): Approx. 9.1 kg (20 lbs)
Housing Material: High-strength cast iron
Fluid Cleanliness: ISO 4406 18/16/13 or better

Data based on Eaton Vickers 743XX Series official technical documentation and Danfoss PowerSource product database.

Key Technical Advantages

1. Valve Plate Fixed Piston Design — High Speed and High Power Density

The 743XX Series utilizes valve plate fixed displacement piston design, with precision-honed piston-cylinder bore pairs and a replaceable bronze-clad port plate. The 40.6 cm³/rev displacement delivers 175.71 L/min flow and 85.30 kW output power at 3,600 rpm maximum speed, offering outstanding power density in its displacement class. Maximum working pressure reaches 350 bar with 370 bar peak pressure for medium-duty high-pressure hydraulic drive applications. The 9.1 kg lightweight pump body reduces installation load for wheel-end or axle-end mounting in mobile machinery.

2. Precision Piston Pairs and High Volumetric Efficiency

Piston pairs are manufactured from high-strength alloy steel with precision-honed cylinder bores, with cylindricity controlled to micron-level tolerance. The port plate bronze surface and piston block interface are precision-machined to maintain high volumetric efficiency at 350 bar continuous pressure. Fixed displacement design ensures output speed is strictly proportional to input flow, suitable for travel drive systems requiring precise speed control. The port plate bronze surface must never be lapped; if wear exists, replacement is mandatory.

3. Wide Speed Range and Closed/Open Circuit Compatibility

The 743XX Series supports speeds up to 3,600 rpm with no minimum speed limit (subject to system flow), accommodating the full range from low-speed high-torque to high-speed travel requirements. The motor is compatible with both closed-circuit and open-circuit hydraulic systems, capable of forming complete hydrostatic drive systems with Sauer Danfoss Series 90 variable pumps. The wide speed range combined with high power density makes the 743XX Series ideal for harvesters, road compactors, and forwarders requiring variable-speed travel drive.

4. Multi-Configuration Flexibility and Full-Lifecycle Serviceability

The 743XX Series offers extensive shaft, port, mounting flange, and backplate configuration options. Main ports are available in 1.0625-12 or 1.3125-12 UN-2B SAE O-ring designs, shafts in 13-tooth or 15-tooth 16/32 spline, with SAE-B 2-bolt mounting flange as standard. All critical friction pairs (pistons, cylinder block, port plate, camplate) can be repaired or replaced without replacing the entire motor, substantially reducing full-lifecycle maintenance costs.

Application Areas

Agricultural Machinery: Combine harvester travel drive, self-propelled sprayer hydraulic drive, bark remover hydraulic transmission, windrower travel system — 74318-DBM configuration
Forestry Machinery: Forwarder travel drive, timber harvester hydraulic transmission, bark remover hydraulic systems
Construction Machinery: Mini excavator travel drive, loader hydraulic travel system, road compactor travel drive
Material Handling: Forklift hydraulic travel drive, scissor lift hydraulic drive, aerial work platform travel system
Municipal & Road Machinery: Snow removal truck hydraulic drive, lawn tractor travel system, road maintenance equipment hydraulic transmission
Industrial Drive: Fan drive systems, automated assembly line hydraulic drive, hydraulic test bench load simulation

Expert Maintenance Tips

Pre-Installation Cleanliness Control: Before installing 743XX Series motors, verify hydraulic system cleanliness meets ISO 4406 18/16/13 or better. Port plugs should be removed and piping connected immediately after unboxing — environmental exposure should not exceed 15 minutes. Before initial installation, fill the motor case approximately half full with clean hydraulic oil. Dry-start is strictly prohibited.

Port Plate and Piston Pair Inspection: The port plate bronze surface and piston block interface are critical to motor performance. The port plate bronze surface must remain smooth — if wear or scoring exists, replacement is mandatory. Never attempt to lap the bronze surface, as this alters critical tolerances. Pistons should move freely within the block bores. If sticky or seized, inspect for contamination or bore scoring; replace the entire rotating kit assembly if severe. The camplate insert contact surface with piston shoes must also remain smooth and free of scratches.

Bolt Torque Specifications: The motor backplate is secured by six cap screws. During reassembly, tighten in a criss-cross pattern to 20.3–24.4 N·m (15–18 lbs·ft.). Uneven torque may cause backplate deformation and leakage.

System Flushing Requirements: If the motor has experienced internal scoring or contamination failure, the entire hydraulic system must be flushed after repair. Metal debris remaining in system lines will rapidly cause the newly repaired motor to seize again. After flushing, fill the motor case half full with clean hydraulic oil before reinstalling.

Oil Maintenance Schedule: Replace hydraulic oil and filter after the first 500 hours of operation. Thereafter, replace every 2,000 hours or 12 months, whichever comes first. Recommended viscosity grade: VG 32–46 anti-wear hydraulic oil. Continuous allowable case pressure is 1.7 bar (25 psi); maximum inlet temperature is 107°C (225°F). Exceeding these limits may cause seal damage and premature motor failure.

Long-Term Storage Protection: For motors stored over 3 months, drain case oil, fill with rust-preventive oil, and plug all ports. Before recommissioning, flush with flushing oil for 30 minutes and confirm flushing oil cleanliness meets specification before connecting to the system. Always fill the case half full with oil before restart.

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78161-RAH-03 TANDEM PUMP ASSY
78161-RAL-03 TANDEM PUMP ASSY 70160-DAA-03 + 70160-RDG-03
78163-LAK-03 TANDEM PUMP ASSY
78361-RAM-02 TANDEM PUMP ASSY (TWIN 2.48 CID MANUAL PISTON PU
78361-RAN-02 TANDEM PUMP ASSY (TWIN 2.48 CID MANUAL PISTON PU
78361-RAR-02 TANDEM PUMP ASSY 70360-RFJ-02 + 70360-RFK-02
78361-RBH-02 TANDEM PUMP ASSY
78363-RAR-02 TANDEM PUMP ASSY
78363-RAS-02 TANDEM 360 W/ BYPASS VALVE
78363-RBP-02 TANDEM PUMP ASSY (TWIN 2.48 CID MANUAL PISTON PUMP W/GP)
78363-RBS-02 TANDEM PUMP ASSY
78363-RBZ-02 TANDEM (360)
78453-LAR TANDEM PUMP ASSY
78453-LAW TANDEM PUMP ASY
78453-LBG TANDEM PUMP ASSEMBLY
78461-004-04 TANDEM PUMP ASSY (TWIN 2.48 CID SERVO PISTON PUM
78461-030-04 TANDEM PUMP ASSY (TWIN 2.48 CID SERVO PISTON PUM
78461-LAK-04 TANDEM PUMP ASSY (TWIN 2.48 CID SERVO PISTON PUM
78461-RAM-04 TANDEM PUMP ASSY
78461-RBM-04 2.48 CID SERVO CONTROLLED PISTON PUMP W/CHARGE P
78461-RDN-04 TANDEM PUMP ASSY
78461-RDT-04 TANDEM PUMP (72400-RSF-04 + 72400-RZY-04)
78461-REH-04 TANDEM SERVO PUMP ASSY
78461-RFD-04 TANDEM PUMP ASSY 72400-SJU-04 + 72400-SJV-04
78462-RAK-04 TANDEM PUMP ASSY (SINGLE2.48 CID MANUAL PISTON
78462-RAN-04 TANDEM PUMP ASSY (SINGLE2.48 CID MANUAL PISTON
78463-RBS-04 TRIPLE PUMP 72400-RDW-04, -RDY-04, 26011-RZA
78464-RAG-04 TANDEM PUMP ASSY 2.48 SERVO & 2.32AUTO
78493-LAB TANDEM PUMP ASSY (TWIN 2.32 CID PFC PISTON PUMPS)

Company Profile

Frequently Asked Questions

1.What ls our Main Products?

1.Hydraulic pump
2.Hydraulic valve
3.Hydraulic motor
4.Hydraulic cylinder
5.Hydraulic parts

2. What about the MOQ?

MOQ: 1pcs— we support sample and small quantity orders.

3.What are your advantages?

Adhere to quality first.
Support customization, ODM & OEM service.
1-year warranty and complete after-sales support.
Safe and fast shipping worldwide.
24-hour online service for your inquiries.

4.Are you a manufacturer? What’s your delivery time?

Yes, we are a manufacturer with our own factory.

Common models are in stock, and orders are usually shipped within 1–3 days.

5.Which payment methods are accepted?

We accept T/T, L/C, PayPal, VISA, Western Union, Apple Pay, Google Pay, Afterpay (Clearpay), Klarna, and Trade Assurance.

For full orders: 30% deposit, balance before shipment.

For small/sample orders: full payment in advance.

6.How will you deliver my goods?

We offer flexible shipping options: DHL, UPS, FedEx, TNT, EMS, as well as air or sea freight.

All deliveries ensure door-to-door fast and safe service.

7.How do you inspect and guarantee your products?

All products are tested before shipment to ensure perfect working condition.

We offer a 12-month warranty — if a product fails due to quality issues, we provide free spare parts or repair support.

8.What about after-sales service?

If you encounter any problem during use, please contact your sales manager or our support team at any time.

We will respond quickly and help solve the issue efficiently.

9.What are your main applications?

Hydraulic systems
Agricultural machinery
Construction machinery
Automobile industry
Local distributors and maintenance centers

10.Can I get a discount for bulk orders?

Yes. We offer competitive wholesale prices and try our best to give benefits to long-term partners.

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