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Jacobs CBRAKE 490 - User Manual

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INSTALLATION MANUAL
Model 490/490A
Installation Manual
ISL98, ISL03, ISL07, ISC07, ISL 2010, ISC 2010,
ISL 2013, L9 2017, L9 2021 Engines
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Summary

Section 1: Introduction

Housing Identification

Identifies engine brake housing via nameplate, including model, part, front/rear, and serial numbers.

Engine Identification

Verifies engine model and year prior to brake installation, checking serial number plate.

Application Notes

Notes on usage, compatibility with exhaust brakes, and specific part numbers for 24v applications.

Special Tools

Recommended Torque Values

Lists specific torque values for mounting spacers, screws, nuts, and caps.

Turbocharger Compatibility

Discusses the need for a new turbo actuator on ISL engines due to increased backpressure.

Automatic Transmissions

Advises consulting transmission manufacturer for compatibility with automatic transmissions.

Section 2: Engine Preparation

Crosshead and Adjusting Screws

Step-by-step instructions for removing, replacing, and adjusting crossheads and adjusting screws.

Section 3: Engine Brake Installation

Engine Brake Installation

Detailed steps for mounting the engine brake housing, including bolt torquing and electrical connection.

For ISL98: Spacer Installation

Specific instructions for installing the spacer on ISL98 engines, including sealant and bolt torquing.

Slave Piston Adjustment

Slave Piston Adjustment

Procedure for adjusting slave piston clearance with the engine stopped and cold, using feeler gauges.

Section 4: Electrical Installation

ISL Wiring Installation

Directs users to Cummins service manual or service center for wiring installation information.

Section 5: Brake Operation Check

Bleed and Operation Check

Procedures for bleeding brake housings and checking engine brake operation after installation.

Replace Rocker Lever Cover

Instructions for installing the new gasket and cover on the spacer, including torquing the capscrews.

Section 6: Brake Maintenance

Theory of Operation

Explains how the engine brake converts a diesel engine into a power-absorbing air compressor.

Exhaust Blowdown

Describes the sequence of events during exhaust blowdown, from solenoid to air escape.

Control Valve

Control Valve

Detailed steps for safely removing, cleaning, and reassembling the control valve assembly.

Solenoid Valve

Solenoid Valve

Instructions for disconnecting, removing, cleaning, and reinstalling the solenoid valve with new seals.

Slave Piston Adjusting Screws (D Lash)

Slave Piston Adjusting Screws (D Lash)

Guidance on inspecting the slave piston adjusting screw, ensuring proper protrusion and free movement.

Master Piston

Master Piston

Procedure for removing, cleaning, inspecting, and reinstalling the master piston and spring.

Slave Piston

Slave Piston

Steps for safely removing and replacing the slave piston using a specialized removal tool.

Jacobs CBRAKE 490 Specifications

General IconGeneral
TypeSpring Applied Brake
ModelCBRAKE 490
Torque RangeUp to 490 Nm
Voltage24V DC
ApplicationAutomation

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