1. Introduction
This document serves as the official instruction manual for the Cincinnati Cost Breaker Hydraulic Press Brake, specifically the 90-135CB Series. It provides essential information for the safe installation, operation, maintenance, and troubleshooting of the machine. Adherence to the guidelines presented herein is crucial for ensuring operator safety, maximizing machine efficiency, and prolonging the service life of the equipment.
This manual is a reproduction of the original Parts & Service Manual, consisting of 45 pages, and is intended for qualified personnel only.

Image 1.1: Cover of the Cincinnati Cost Breaker Hydraulic Press Brake 90-135CB Series Parts & Service Manual. This image displays the front cover of the physical manual, indicating its title and series information.
2. Safety Information
Operating a hydraulic press brake involves significant risks. It is imperative that all personnel involved in the setup, operation, or maintenance of the 90-135CB Series machine read and understand all safety warnings and instructions before use. Failure to comply with safety procedures can result in serious injury or death.
- Always wear appropriate Personal Protective Equipment (PPE), including safety glasses, gloves, and steel-toed boots.
- Ensure all safety guards and interlocks are in place and functioning correctly before operation.
- Never place hands or body parts between the ram and the die during operation.
- Perform lockout/tagout procedures before any maintenance or adjustment.
- Only trained and authorized personnel should operate or service the machine.
3. Setup
Proper setup is critical for the safe and efficient operation of the hydraulic press brake. Follow these general steps for initial installation and preparation:
- Site Preparation: Ensure the installation area is level, has adequate space for operation and maintenance, and can support the machine's weight.
- Unpacking and Inspection: Carefully unpack the machine and inspect for any shipping damage. Report any damage immediately.
- Anchoring: Securely anchor the press brake to the floor using appropriate fasteners to prevent movement during operation.
- Electrical Connection: Connect the machine to the correct power supply as specified on the machine's data plate. Ensure proper grounding.
- Hydraulic Fluid: Check and fill the hydraulic reservoir with the recommended hydraulic fluid to the specified level.
- Tooling Installation: Install the appropriate upper and lower dies securely according to the bending requirements.
- Initial Checks: Before first operation, perform a thorough check of all controls, emergency stops, and safety devices.
4. Operating Procedures
Operating the Cincinnati 90-135CB Series press brake requires precision and adherence to established procedures. Always prioritize safety.
- Pre-Operation Checklist: Verify that all safety guards are in place, the work area is clear, and the tooling is correctly installed.
- Power On: Turn on the main power switch. Allow the hydraulic system to pressurize.
- Program Setup: Input the desired bending angle, depth, and back gauge position into the control system.
- Material Placement: Carefully position the workpiece against the back gauge and centered on the lower die.
- Bending Cycle: Initiate the bending cycle using the foot pedal or two-hand controls. Ensure hands are clear of the bending area.
- Workpiece Removal: Once the bend is complete and the ram has returned to its home position, safely remove the workpiece.
- Emergency Stop: Familiarize yourself with the location and operation of all emergency stop buttons.
5. Maintenance
Regular maintenance is essential for the longevity and reliable performance of your hydraulic press brake. Perform maintenance only after the machine has been powered off and locked out.
- Daily Checks: Inspect for hydraulic leaks, check fluid levels, and ensure all safety devices are operational. Clean the work area.
- Weekly Checks: Lubricate moving parts as specified in the machine's lubrication chart. Inspect tooling for wear or damage.
- Monthly Checks: Check hydraulic filter condition and replace if necessary. Inspect electrical connections for tightness.
- Annual Service: A comprehensive inspection by a qualified technician is recommended, including hydraulic system flush and calibration checks.
- Hydraulic System: Monitor hydraulic fluid quality and temperature. Replace fluid according to manufacturer recommendations.
6. Troubleshooting
This section provides guidance on common issues that may arise during the operation of the Cincinnati 90-135CB Series press brake. For complex problems, contact qualified service personnel.
| Problem | Possible Cause | Solution |
|---|---|---|
| Machine does not power on | No power supply; Emergency Stop engaged; Blown fuse/tripped breaker | Check main power; Reset Emergency Stop; Inspect and replace fuse/reset breaker |
| Ram does not move | Low hydraulic fluid; Hydraulic pump issue; Control system error | Check hydraulic fluid level; Inspect pump; Consult control system manual |
| Inaccurate bends | Worn tooling; Incorrect program settings; Material inconsistencies | Inspect and replace tooling; Verify program parameters; Account for material springback |
| Hydraulic fluid leak | Loose fittings; Damaged seals/hoses | Tighten fittings; Replace damaged components (contact service) |
7. Specifications
The following specifications pertain to the physical manual itself, as detailed in the product information. Specific technical specifications for the Cincinnati Cost Breaker Hydraulic Press Brake 90-135CB Series machine are not provided within this manual's description.
- ASIN: B00NGW86MS
- Publisher: Cincinnati
- Publication Date: January 1, 1960
- Item Weight: 12 ounces
- Format: Plastic Comb (as per variant information)
- Pages: 45
8. Support and Warranty
Information regarding specific warranty terms or direct technical support contacts for the Cincinnati Cost Breaker Hydraulic Press Brake 90-135CB Series is not detailed within the scope of this manual's description. For warranty claims, technical assistance, or to order replacement parts, please refer to the original purchase documentation or contact your authorized Cincinnati dealer.
This manual is a reproduction and does not imply any direct warranty from the reproducer for the machine itself.