The Hi-Force HP-Manually Operated Hydraulic Pump (Steel) is a robust and versatile tool designed for operating single-acting hydraulic cylinders and other hydraulic tools. It is engineered to handle a maximum working pressure of 700 bar (10,000 psi), making it suitable for a wide range of industrial applications requiring high-pressure hydraulic force. This manual specifically covers the steel versions of these pumps, including models like HP110, HP227, HP257, HP227FP, and HP227FPC.
Function Description:
The primary function of the Hi-Force HP pump is to generate and control high-pressure hydraulic fluid to power single-acting hydraulic tools. It achieves this through manual operation, typically involving a handle (or a foot-operated handle for FP and FPC models) that actuates an internal pumping mechanism. The pump draws hydraulic oil from its reservoir and delivers it under pressure to the connected hydraulic cylinder or tool. A key feature is the adjustable pressure relief valve, factory-set to the maximum working pressure of the specific pump model, which can be adjusted by the customer to a desired pressure within the pump's rating. This ensures safe operation and prevents over-pressurization of the system. The pump also includes a release valve to safely relieve system pressure and return hydraulic fluid to the reservoir.
Important Technical Specifications:
The HP series pumps are designed to operate effectively in a temperature range of -20°C to 80°C, utilizing either ISO15 or ISO46 hydraulic oil depending on the specific model and desired operating temperature range. ISO15 oil is suitable for temperatures from -23°C to 44°C, while ISO46 oil is for -2°C to 73°C.
Key specifications vary by model:
- HP110 (Single Stage):
- Valve Type: 2-way
- Displacement per stroke: 2.9 cm³ (1st stage)
- Usable Oil Capacity: 1.0 litres
- Handle Effort: 45 kg
- Weight: 5.6 kg
- HP227 (Two Stage):
- Valve Type: 2-way
- Displacement per stroke: 12.9 cm³ (1st stage), 2.3 cm³ (2nd stage)
- Usable Oil Capacity: 2.3 litres
- Handle Effort: 38 kg
- Weight: 10.5 kg
- HP257 (Two Stage):
- Valve Type: 2-way
- Displacement per stroke: 12.9 cm³ (1st stage), 2.3 cm³ (2nd stage)
- Usable Oil Capacity: 4.1 litres
- Handle Effort: 38 kg
- Weight: 15.2 kg
- HP227FP (Two Stage, Foot Operated Handle):
- Valve Type: 2-way
- Displacement per stroke: 12.9 cm³ (1st stage), 2.3 cm³ (2nd stage)
- Usable Oil Capacity: 2.3 litres
- Handle Effort: 38 kg
- Weight: 10.5 kg
- HP227FPC (Two Stage, Foot Operated Handle, Pressure Gauge, Gauge Mounting Block, 3m Hoses with Male Coupler):
- Valve Type: 2-way
- Displacement per stroke: 12.9 cm³ (1st stage), 2.3 cm³ (2nd stage)
- Usable Oil Capacity: 4.1 litres
- Handle Effort: 38 kg
- Weight: 15.2 kg
All models feature a 3/8" NPT female threaded outlet port for hydraulic connections.
Usage Features:
The Hi-Force HP pumps are designed with user safety and efficiency in mind.
- Preparation and Setup: Before first use, operators must check for wear, unscrew the transit plug, and fit the breather to maximize oil volume and prevent reservoir pressure build-up. Filling the pump with fluid requires standing it on a firm, level surface, removing the filler cap (or transit plug/breather for HP227/HP257 models), and filling with clean, high-quality ISO15 hydraulic oil, leaving a small air space. It's crucial to only add fluid when the connected system is fully de-pressurized.
- Hydraulic Connections: Connections to the outlet port (6) should be made using a 3/8" NPT female thread and sealed with a suitable thread sealant. Overtightening is warned against to prevent damage. When connecting couplers, they must be fully engaged and hand-tight only.
- Bleeding Trapped Air: A critical step for safe and efficient operation is removing trapped air from the hydraulic system. This procedure, to be performed by qualified personnel, involves positioning the cylinder/s below the pump level and repeatedly advancing and retracting the piston until operation is smooth. Pre-filling hoses with fluid can reduce air introduction.
- Operation: Operators are advised to read and understand all safety warnings and operating instructions. The pressure relief valve, while factory-set, can be adjusted by the customer. It is crucial never to exceed the pump's rated maximum working pressure or the system's maximum pressure. During operation, the pressure release valve (7) is turned clockwise to close it, and the pump handle (2) is operated to pressurize the system. Smooth, steady action of the handle is recommended to prevent over-pressurization and reduce operator fatigue. Handle extensions are explicitly prohibited. System pressure is released by slowly opening the pressure release valve anti-clockwise.
- Safety Precautions: The manual emphasizes numerous safety precautions, including wearing appropriate Personal Protective Equipment (PPE) like steel toe-cap safety shoes, safety glasses/visor, and protective gloves. It warns against handling pressurized hoses, disconnecting hoses under pressure, or using couplers as tool handles. Operators must avoid working under the influence of alcohol, drugs, or medication. Specific warnings for the pump include never inverting or laying the pump on its side, not welding or modifying the pump, and never exceeding the maximum rated capacity of the pump or circuit. The pump relief valve protects the pump, not the entire system, against overloading.
Maintenance Features:
Regular maintenance is crucial for the longevity and safe operation of the Hi-Force HP pumps.
- Pre/Post Use Inspection: Operators should inspect the pump for any damage before and after each use.
- Fluid Management: Maintaining clean hydraulic fluid is essential, with changes made as necessary. Only the specified hydraulic oil grade (ISO15 or ISO46) should be used to protect the warranty.
- Contamination Prevention: To prevent contaminants from entering the system, dust caps should be fitted to couplers, and open ports should be blanked off.
- Storage: Before storing, the pump pressure must be zeroed. The transit plug should be replaced to prevent moisture/dirt entry and accidental environmental spillage.
- Professional Servicing: The manual strongly recommends that the pump be serviced regularly by a Hi-Force authorized repair centre. Troubleshooting common problems like no fluid delivery, handle dropping, handle rising with pressure drops, hard pumping, loss of effective stroke, or erratic pressure readings often involves checking oil levels, suction/delivery valve seating, or contacting a Hi-Force distributor for steel ball replacement or other repairs.
- Label Integrity: All labels on the product should be kept intact and replaced immediately if damaged or unreadable.
Overall, the Hi-Force HP-Manually Operated Hydraulic Pump (Steel) is presented as a reliable, high-performance tool for demanding hydraulic applications, with a strong emphasis on proper usage, safety, and regular maintenance to ensure optimal performance and operator well-being.
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