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This 'Original instructions' document assumes that the operator carrying out any operation with this
product is trained and competent to do so. This manual does not attempt to cover all details or variations
in the equipment. Nor does this manual claim to provide for every possible contingency met in connection
with the installation, operation, or maintenance thereof. Should further information be desired, or should
a particular problem arise which is not covered in sufficient detail, the matter should be referred to
Hi-Force.
OPERATING INSTRUCTION MANUAL
TWH-N SERIES | HYDRAULIC TORQUE WRENCHES
Hi-Force TWH-N series of light-weight aluminium Low Profile Hydraulic Torque Wrenches are ideally suited
to bolt torqueing applications with limited access. TWH-N Torque wrenches are available in torque
capacities up to 48181 N·m at a maximum working pressure of 700 bar (10,000 psi). This manual applies
to the Hi-Force TWH-N series Hydraulic Torque Wrenches Only. It contains the latest product information
available at the time of publication and approval. Hi-Force reserves the right to make changes to this
document at any time without notice.
Operating Instruction Manual:
OM-TWH-N-01
- LOW PROFILE HEXAGON
1
Serial Numbers:
See Table Page 2
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Related Manuals for Hi-Force TWH-N Series
Summary of Contents for Hi-Force TWH-N Series
- Page 1 48181 N·m at a maximum working pressure of 700 bar (10,000 psi). This manual applies to the Hi-Force TWH-N series Hydraulic Torque Wrenches Only. It contains the latest product information available at the time of publication and approval. Hi-Force reserves the right to make changes to this document at any time without notice.
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Page 2: Table Of Contents
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 Table of Contents 1.0 Inspection upon Receipt ..................3 2.0 Safety Precautions ....................3 2.1 Introduction ......................3 2.2 Work Area Safety ....................3 2.3 General Hydraulic System Safety Precautions ..........3 2.4 Hydraulic Torque Wrench Specific Safety Precautions ........ -
Page 3: Inspection Upon Receipt
If in doubt on the correct use of any Hi-Force equipment, contact your nearest Hi-Force office or distributor. Only qualified personnel should be allowed to operate hydraulic equipment. If an operator has not been trained on high-pressure hydraulic equipment and its safe usage, consult your local Hi-Force sales office or distributor who can offer training courses for operators. - Page 4 • Immediately replace any worn or damaged parts using genuine Hi-Force parts only. • DO NOT remove any labels from the product. Replace any damaged or unreadable label immediately.
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Page 5: Hydraulic Torque Wrench Specific Safety Precautions
NEVER exceed the maximum rated pressure of any hydraulic equipment. Hi-Force manufactures its TWH-N hydraulic pumps to operate at a maximum working pressure of 700 bar (10,000 psi). DO NOT connect a pump with a higher-pressure capacity rating to any Hi-Force tool of this model series. -
Page 6: Declaration Of Incorporation / Conformity
3.0 Declaration of Incorporation / Conformity Hi-Force declares that this product has been tested and complies with the standards set out in the relevant EU directives. The EU Declaration of Incorporation / Conformity is included as Annex A to this instruction... -
Page 7: Component Identification
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 4.0 Component Identification ‘Ratchet Head’ Link Pin Drive Cylinder Female Advance Coupler (700 bar) Ratchet Head (Sold Separately) Male Retract Coupler (90 bar) Shroud 360° Uni-Swivel Figure 4.1: Component Identification... -
Page 8: Installation / Setup
Make sure both coupler halves are clean before connecting. If you are NOT using a Hi-Force Torque Wrench pump, or if the pump or hoses have been modified, make sure that the wrench is connected correctly so that the female high-pressure advance coupler (2) is connected to the advance port on the pump. -
Page 9: Connections (See Figure 5.1)
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 5.2.1 Connections (See figure 5.1) Connections between couplers are made by simply [1] pressing the male coupler into the female coupler until [2] the locking collar springs forward and locks the couplers together. Make certain the spring-loaded retaining rings are fully engaged to prevent the connectors from disengaging under pressure. -
Page 10: Connecting A Torque Wrench To The Pump
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 5.2.3. Connecting a Torque Wrench to the Pump • Connect the female coupler on the red hose to the male advance coupler on the pump. • Connect the male coupler on the black hose to the female retract coupler on the pump. Figure 5.3: Connecting to the Pump •... -
Page 11: Operation
See Table Page 2 6.0 Operation Hi-Force TWH-N Torque Wrenches require a suitable double-acting Hydraulic Torque Wrench pump for operation. Make sure you read this manual in conjunction with the Torque Wrench Pumps operating instruction manual to ensure correct and safe operation of all hydraulic equipment in the system. -
Page 12: Attaching The Ratchet Head
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 6.1 Attaching the Ratchet Head Before attempting to attach the ratchet head to the drive unit, make sure: • The torque wrench piston is fully retracted (see figure 6.1). An extended piston will make the ratchet head difficult or impossible to fit. -
Page 13: Setting The Torque
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 To attach the ratchet head to the drive unit: • Make sure the piston is retracted and the drive plate is pushed forward (See Section 6.1). • Push the Ratchet head link-pin out of the drive unit body (Newer versions are captive in the ratchet head). -
Page 14: Operating The Wrench
See Table Page 2 6.3 Operating the Wrench Hi-force recommends that operation of the pump/wrench combination be a minimum 2-person job, one to operate the pump and one to operate the wrench. An additional operator will be required for each additional wrench connected to the pump. - Page 15 Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 3. After turning on the pump and pre-setting the pressure for the correct torque, signal the pump operator to depress the advance button on the control pendant and advance the piston assembly. (See pump manual) NOTE: If the notch in the piston rod did not engage the retract pin in the ratchet head when the head was joined to the housing, it will engage the pin automatically during the first advance stroke.
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Page 16: Maintenance And Storage
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 7.0 Maintenance and Storage Carry out basic maintenance on a regular basis to keep the torque wrench operating in a trouble-free manner. Maintenance intervals are determined by the frequency of use and the operating conditions on site. -
Page 17: Specifications
8.1 Oil Specifications Hi-Force tools will use 1 of 2 grades of oil, dependant on the pump used. The tools are designed to operate at temperatures between -20°C and 80°C. Details of the oil used can be found in the chosen Hi-Force pump’s operating manual, in the section: FILLING OF PUMP WITH OIL. -
Page 18: System Components / Accessories
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2 9.0 System Components / Accessories (Refer to the Hi-Force website or latest Hi-Force catalogue, for further details) • HTWH Series High-Pressure Hydraulic Hoses (Up to 100m). • HTWR1 Torque Wrench Hose Reel. -
Page 19: Torque Conversion Charts
Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2... - Page 20 Operating Instruction Manual: Serial Numbers: OM-TWH-N-01 See Table Page 2...
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Page 21: Troubleshooting
Serial Numbers: OM-TWH-N-01 See Table Page 2 11.0 Troubleshooting Hi-Force TWH-N Low Profile Hexagon Torque Wrenches should be serviced and repaired only by authorised Hi-Force repair centres. The following table gives possible causes and solutions for common problems. TROUBLESHOOTING GUIDE... - Page 22 Problem Possible Cause Solution 8. Erratic tool movement. a. Leakage from pump or valve Contact your local Hi-Force office / distributor. internal components. b. Internal leak, due to damaged/worn Contact your local Hi-Force office / distributor. seals or valves. c. Oil level too low.
- Page 23 Operating Instruction Manual: From Serial Number: OM-TWH-N-01 Head Office: Hi-Force Limited Prospect Way, Daventry Northamptonshire NN11 8PL United Kingdom Tel: + 44 1327 301000 | Fax: + 44 1327 706555 www.hi-force.com Regional Offices: For information on our offices worldwide, scan the below QR code...
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