SGP1-32AS1HH-L201C Shimadzu Gear Pump | 33.2cc 206 bar for Forklift

Product Overview

The SGP1-32AS1HH-L201C is a representative model of the SHIMADZU SGP1 series high-performance external hydraulic gear pumps. Featuring a displacement of 33.2 cc/rev, this SGP1-32 size pump is widely used in forklifts, construction machinery, and agricultural equipment.

The SGP1 series gear pump features automatic axial clearance compensation and radial hydraulic balance. With a three-piece construction design, the pump incorporates DU bushings (self-lubricating bearings) in the bearing blocks and bimetallic side plates; the front and rear covers are aluminum die-castings while the center section is cast iron. This precision-engineered combination effectively enhances performance and reliability.

The SGP1 series uses a specialized cast iron body designed to withstand adverse conditions of surge pressure, wide temperature, and wide speed ranges, maintaining high performance especially during high temperature and low speed operation. Through precise structural design, the series maintains high volumetric and mechanical efficiency. The aluminum body with high-precision molding design ensures low-noise operation.

Engineered as a direct OEM-replacement solution, this model fully complies with SHIMADZU original design standards and mounting interface specifications, offering 100% direct interchangeability with OEM pumps. Every unit undergoes 100% workload simulation testing prior to shipment, rigorously validating pressure retention, volumetric efficiency, and internal leakage performance to meet or exceed OEM standards.

Model Code Breakdown (Bulleted List) :

• SGP1 — Series: SHIMADZU SGP1 External Gear Pump

• 32 — Nominal size: Size 32 (actual displacement 33.2 cc/rev)

• AS1HH — Configuration code (flange, shaft, and port specifications)

• L — Rotation: L = Left-hand (counter-clockwise, viewed from shaft end)

• 201C — Design/configuration suffix code

Technical Specifications 

• Model: SGP1-32AS1HH-L201C

• Brand: SHIMADZU

• Series: SGP1 External Gear Pump

• Theoretical Displacement: 33.2 cc/rev

• Rated Pressure: 20.6 MPa (approx. 206 bar)

• Peak Pressure: 24.5 MPa (approx. 245 bar)

• Maximum Speed: 3000 – 3500 r/min (depending on configuration)

• Minimum Speed: 400 r/min

• Rotation Direction: Left-hand (counter-clockwise, viewed from shaft end)

• Inlet Pressure: -0.02 ~ 0.2 MPa

• Inlet Port: Ø25 mm (PT1″)

• Outlet Port: Ø19 mm (PT3/4″)

• Weight: 4.2 – 4.3 kg

• Housing Material: Aluminum (front/rear covers) / Cast iron (center section)

• Bearing Type: DU bushings (self-lubricating)

• Side Plate Material: Bimetallic

• Construction Type: Three-piece construction

Key Technical Advantages

1. Automatic Axial Clearance Compensation & Radial Hydraulic Balance
The SGP1 series features advanced automatic axial clearance compensation and radial hydraulic balance technology, automatically adjusting internal clearances under varying operating pressures to minimize internal leakage and maintain high volumetric efficiency across the full pressure range.

2. Three-Piece Construction with DU Bushings – Long Life & High Reliability
The three-piece construction design incorporates DU bushings (self-lubricating bearings) in the bearing blocks and bimetallic side plates. High wear-resistant bearings ensure long service life even under high-pressure and high-speed operation.

3. Special Cast Iron Body – Surge Pressure & Temperature Resistant
The SGP1 series uses a specialized cast iron body designed to withstand adverse conditions of surge pressure, wide temperature, and wide speed ranges. It maintains high performance especially during high temperature and low speed operation.

4. High Efficiency & Low-Noise Operation
Through precise structural design, the series maintains high volumetric and mechanical efficiency. The aluminum body with high-precision molding design ensures low-noise operation. The pump features light weight, compact and exquisite structure.

5. Flexible Configuration & Combination Capability
SGP1 series gear pumps can be configured as double pumps and four-section pumps. Various SAE and national standard flanges, shaft extensions, and inlet/outlet connections are available.

6. OEM-Proven Reliability
The SGP1 series is extensively used as OEM components for forklifts, construction machinery, agricultural equipment, and more.

7. 100% Factory Tested & Direct Interchangeability
Every unit undergoes 100% workload simulation testing prior to shipment, covering pressure retention verification, internal leakage detection, and flow validation. Fully compliant with SHIMADZU original design standards, with flange dimensions, shaft specifications, and mounting interfaces identical to OEM pumps—direct drop-in replacement with zero modifications required.

Application Areas

The SGP1-32AS1HH-L201C gear pump is widely used in the following equipment:

• Forklifts: Electric forklift hydraulic lifting systems, steering systems

• Construction Machinery: Excavators, loaders, and other mobile machinery hydraulic systems

• Tractors: Agricultural tractor hydraulic systems

• Other Machinery: Various industrial and agricultural machinery hydraulic systems

Expert Maintenance Tips

1. Model Confirmation
The SGP1-32AS1HH-L201C offers 33.2 cc/rev displacement. The SGP1 series includes multiple displacement options (16/18/20/23/25/27/30/32/34/36). Before installation, confirm the correct displacement based on system flow requirements and verify the complete model code on the pump nameplate.

2. Rotation Direction Confirmation
The “L” in the model designation indicates left-hand rotation (counter-clockwise, viewed from shaft end). Before installation, always verify that the PTO rotation direction of the host machine matches the pump’s rotation direction—incorrect rotation will result in pump failure to prime and may cause severe damage to gears and bearings within a short period.

3. Installation Precautions

• Thoroughly clean the mounting flange and shaft mating surfaces before installation to ensure no debris remains

• SGP1 series features horizontal 2-bolt mounting

• Use SHIMADZU-specified torque values for mounting bolts—avoid over-tightening which may cause housing distortion

• Ensure correct connection of inlet port (Ø25 / PT1″) and outlet port (Ø19 / PT3/4″)

4. First Start-Up and Bleeding

• Before first start-up, must fill the pump with hydraulic oil through the inlet port—never start dry

• After start-up, run at low speed with no load for 2–3 minutes to ensure complete air evacuation from the system

• Check for abnormal noise or leakage—aluminum housing pumps are particularly sensitive to cavitation

5. Fluid and Filtration

• Use high-quality anti-wear hydraulic oil compliant with ISO VG 32–68 grades

• Maintain inlet pressure within -0.02 ~ 0.2 MPa range

• Maintain system oil cleanliness with filtration ≤ 25 μm recommended

• Maintain operating temperature within recommended range

6. Periodic Maintenance

• Check mounting bolt torque every 1,000 operating hours

• Regularly monitor system operating pressure—not to exceed 20.6 MPa rated pressure (24.5 MPa peak)

• The SGP1 series is known for long service life and low maintenance requirements—nevertheless, regularly inspect shaft seals to prevent leakage

• If flow output decreases, noise levels increase abnormally, or system temperature rises excessively, inspect and replace worn components promptly