Knorr-Bremse SKP User Manual

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Doc. No. Y276710 (EN - Rev. 001)

May 2020

ELECTRICAL SCREW COMPRESSOR

SERVICE MANUAL

Questions and Answers:

P
Patricia Smith MDAug 21, 2025
Why is the unloader valve K popping on my Knorr-Bremse SKP?
- S
  smithtracyAug 21, 2025
  The unloader valve K on your Knorr-Bremse compressor might be popping due to several reasons: * The unloader valve itself may be defective. In this case, exchange the unloader valve. * The minimum pressure valve L could be sticking. Exchange the min pressure valve. * The coalescing filter D may be defective. Exchange the coalescing filter. * The air system might be defective, such as a clogged delivery line. Check the air system. If none of these steps resolve the issue, the compressor itself may be defective and should be sent to Knorr-Bremse for repair.
D
Daniel MullinsAug 27, 2025
How to troubleshoot if my Knorr-Bremse SKP motor doesn’t reach nominal speed?
- S
  Sarah CortezAug 28, 2025
  If your Knorr-Bremse compressor motor set isn’t reaching nominal speed, consider these potential causes: * Ambient temperature lower than the design rating: Stop operation. Note that ignoring this rule will forfeit the warranty. KNORR-BREMSE offers special solutions for very low temperatures. * The compressor may be defective: Remove the compressor set and send it to KNORR-BREMSE for repair.

Knorr-Bremse SKP Specifications

General

Brand	Knorr-Bremse
Model	SKP
Category	Compressor
Language	English

Summary

Disclaimer

Safety and Environment Guidelines

General Information

Technical Changes

Details any modifications or updates made to the compressor unit or the service manual.

Target Group

Identifies the intended users and their required expertise for this manual.

Notes and Warning Messages

Explains the meaning of safety symbols like DANGER, WARNING, CAUTION, and NOTE.

Basic Safety Information

Validity

Specifies the product models and type designations this manual covers.

Operator's Commitment to Due Care

Covers operator responsibilities regarding personnel, document availability, and parts usage.

Technical Description

Installation and Removal

4.1 Installation

Details the procedures and precautions for installing the electrical screw compressor unit.

4.1.1 Handling

Instructions on how to properly handle the compressor unit during installation, including lifting.

4.1.2 & 4.1.3 Disconnect and Mechanical Installation

Steps to disconnect the compressor and perform its mechanical mounting and alignment.

4.1.4 Air Connection

Guidance on connecting the compressor's air inlet and outlet ports.

4.1.5 Coolant Connection

Procedure for connecting the compressor's coolant lines.

4.1.6 & 4.1.7 Electrical Connection and Storage

Details on electrical connections and recommendations for storing the compressor unit.

4.2 Removal Procedures

Safety warnings and instructions for safely removing the compressor from the vehicle.

Maintenance

Compressor Design Overview

Visual identification and labeling of key compressor components.

Inspection Procedures

Guidelines and safety checks for performing regular inspections of the compressor.

Servicing Procedures

Detailed steps for servicing the compressor, including oil drainage and filter replacement.

Repair Information

Guidance on when and how to seek professional repair services for the compressor.

Troubleshooting

Motor Compressor Set Fails to Start

Diagnoses and actions for when the motor compressor set fails to start.

Temperature Switch F Turns Off E-Motor

Steps to resolve issues where the temperature switch F causes the e-motor to shut off.

Abnormally High Oil Consumption

Identifies causes and solutions for excessive oil consumption by the compressor.

Excessive Noise Level

Diagnoses and remedies for excessive noise generated by the compressor.

Disposal