BENDIX TU-FLO 750 COMPRESSOR User Manual

1
®
SD-01-344
DESCRIPTION
The function of the air compressor is to provide and main-
tain air under pressure to operate devices in the air brake
and/or auxiliary air systems. The Tu-Flo
®
750 compressor
is a two cylinder single stage, reciprocating compressor
with a rated displacement of 16.5 cubic feet per minute at
1,250 RPM.
The compressor assembly consists of two major
subassemblies, the cylinder head and the crankcase. The
cylinder head is an iron casting which houses the inlet,
discharge, and unloader valving. (See Figure 1.) The cylinder
head contains the air inlet port and is designed with both
top and side air discharge ports. Three water coolant ports
provide a choice of coolant line connections. Governor
mounting surfaces are provided at both the front and the
rear of the cylinder head. The head is mounted on the
crankcase and is secured by six cap screws. The Tu-Flo
®
750 compressor is designed such that the cylinder head
can be installed in one of two positions which are 180 degrees
apart. The crankcase houses the cylinder bores, pistons,
crankshaft and main bearings, and provides the flange or
base mounting surface.
Bendix
®
Tu-Flo
®
750 Air Compressor
BENDIX
®
TU-FLO
®
750 AIR COMPRESSOR
(CROSS SECTION)
BENDIX
®
TU-FLO
®
750 AIR COMPRESSOR
(EXTERIOR)
AIR DISCHARGE
WATER OUTLET
PIECE NO.
TAG
GOVERNOR
MOUNTING
PAD
CRANKCASE
PISTON RINGS
PISTON
CRANKSHAFT
CONNECTING
ROD
INLET VALVE
SEAT
UNLOADER
INLET VALVE
CYLINDER
HEAD
END VIEW OF CYLINDER HEAD
DISCHARGE
VALVE SPRING
DISCHARGE
VALVE
DISCHARGE
VALVE STOP
AIR INLET
CRANKCASE
INLET
INLET VALVE
SPRING
DISCHARGE
VALVE SEAT
UNLOADER
COVER
WATER
INLET
CYLINDER
HEAD

BENDIX TU-FLO 750 COMPRESSOR Specifications

General

Brand	BENDIX
Model	TU-FLO 750 COMPRESSOR
Category	Air Compressor
Language	English

Summary

Compressor Working Principles

Operational Modes

Explains intake, compression, and unloaded states of the compressor.

Compressor Maintenance and Performance

Preventative Maintenance Overview

Essential maintenance schedules and intervals for system reliability.

Compressor Disassembly and Leakage Tests

Air Leakage Testing

Methods to test for unloader piston and discharge valve leakage.

Removal and Disassembly Procedures

Step-by-step instructions for removing and taking apart the compressor.

Component Disassembly and Inspection

Crankcase and Connecting Rod Disassembly

Detailed steps for disassembling crankcase, connecting rods, and bearings.

Parts Cleaning and Inspection

Component Repair and Reassembly

Piston Ring and Crankshaft Inspection

Procedures for inspecting piston rings, crankshaft journals, and bearings.

Repair Procedures

Specific instructions for repairing unloader and discharge valve mechanisms.

Compressor Assembly

Installing Crankshaft and Pistons

Guides for installing the crankshaft, connecting rods, pistons, and rings.

Final Assembly and Testing

Final Compressor Assembly

Steps for completing the compressor assembly and final checks.

Testing Rebuilt Compressor

Procedures for testing the compressor after rebuild to ensure proper function.

Tu-Flo 750 Air Compressor Specifications

Key technical data and performance parameters for the compressor.

Specifications and Troubleshooting Overview

Torque Specifications

Compressor Troubleshooting Introduction

How to use the troubleshooting section and general safety precautions.

General Safety Precautions

Safety Guidelines

Comprehensive safety warnings and precautions for working on vehicle systems.

Maintenance and Usage Guidelines

Maintenance Schedule Table

Recommended maintenance intervals based on vehicle usage and compressor type.

Troubleshooting Guide

How to Use the Guide

Instructions on navigating the troubleshooting section to find solutions.

Safety Warnings for Troubleshooting

Critical safety warnings to follow before performing any maintenance or troubleshooting.

Troubleshooting: Oil in Reservoirs

Oil in Supply or Service Reservoir

Diagnoses the presence of oil in air reservoirs and initial checks.

Troubleshooting: System Performance

Slow System Pressure Build-up

Diagnoses causes for slow air pressure build-up in the charging system.

Troubleshooting: Pressure Build-up Issues

Restricted Discharge Line

Restricted or Poorly Filtered Air Inlet

Troubleshooting: Air System Performance Failure

System Air Charging Failure

Addresses issues where the air charging system fails to build air pressure.

Compressor Safety Valve Releases Air

Diagnostic Tests

Test 2: Air Brake System Leakage

Test 3: Discharge & Dryer Inlet Temperature

Diagnostic Tests (Continued)

Test 4: Governor Malfunction

Test 6: Compressor Unloader Leakage

Appendix A: BASIC Test Kit Information

BASIC Test Overview and Procedure

Introduction to the Bendix Air System Inspection Cup (BASIC) test and its purpose.

Appendix A: BASIC Test Kit Procedure

Checklist and Initial Steps

Measure Charging System Contents

Appendix A: BASIC Test Interpretation

How to Use the BASIC Test Chart

Guidance on interpreting test results using the acceptance lines on the BASIC cup.

Air Brake System Leakage Test