BENDIX TU-FLO 400-500-1000 AIR COMPRESSOR manual Test Procedures, Maintenance & Usage Guidelines

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This troubleshooting guide obsoletes and supersedes all previous published

troubleshooting information relative to Bendix air compressors.

Advanced Troubleshooting Guide

for Air Brake Compressors*

The guide consists of an introduction to air brake charging system components, a table showing recommended vehicle maintenance schedules, and a troubleshooting symptom and remedy section with tests to diagnose most charging system problems.

INDEX

Symptom

Page Number

Air

Air brake charging system:

Slow build (9.0) . . . . . . . . . . . . . . . . . 24 - 25 Doesn’t build air (10.0) . . . . . . . . . . . . . . . 26

Air dryer:

Doesn’t purge (14.0) . . . . . . . . . . . . . . . . . 27 Safety valve releases air (12.0) . . . . . . . . . 27

Compressor:

Constantly cycles (15.0) . . . . . . . . . . . . . . 27 Leaks air (16.0) . . . . . . . . . . . . . . . . . . . . . 28 Safety valve releases air (11.0) . . . . . . . . . 26 Noisy (18.0) . . . . . . . . . . . . . . . . . . . . . . . . 28

Reservoir:

Safety valve releases air (13.0) . . . . . . . . . 27

Symptom

Page Number

Coolant

 

 

Compressor leaks coolant (17.0) .

. . . . . .

. . . 28

Engine

 

 

Oil consumption (6.0)

. . . . . .

. . . 24

Oil

 

 

Oil Test Card results (1.0)

. . . . . .

. . . 19

Oil is present:

 

 

On the outside of the compressor (2.0)

. . . 20

At the air dryer purge/exhaust

 

 

or surrounding area (3.0) . .

. . . . . .

. . . 20

In the supply reservoir (4.0) . . .

. . . . .

21 - 23

At the valves (5.0)

. . . . . .

. . . 23

At air dryer cartridge (7.0) . . . .

. . . . . .

. . . 24

In the ping tank or compressor

 

 

discharge aftercooler (8.0) .

. . . . . .

. . . 24

Test Procedures

(1) Oil Leakage at Head Gasket . . . 29

(2) System Leakage . . . . . . . . . . . . 29

(3) Compressor Discharge and

Air Dryer Inlet Temperature . . . . 29

(4) Governor Malfunction . . . . . . . . 30

(5) Governor Control Line . . . . . . . . 30

(6) Compressor Unloader . . . . . . . . 30

BASIC Test Information . . . . . . 32-34

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Maintenance & Usage Guidelines

Maintenance Schedule and

Usage Guidelines (Table A) . . 18

*This guide is only for vehicles that use desiccant air dryers.

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Contents SD-01-326 General DescriptionOperation Intake and Compression LoadedCompressor & the AIR Brake System Cooling Preventive MaintenancePolyurethane Sponge Strainer Fig Removing and Installing Installation ENGINE-LUBRICATED TypesDRY Element Pleated Paper AIR Strainer FIG AIR Leakage TestsDisassembly Removing and DisassemblyConnecting ROD Assemblies Crankcase Base Plate or AdapterCrankcase Fig TU-FLO400 AIR Compressor Vertical Mount Engine LubricatedCleaning Inspection of PartsCrankcase and END Covers Inlet Valves and SeatsCylinder Bores PistonsRepairs Assembly Installing Cylinder BlockInstalling Crankshaft Pistons and Connecting RodsBaseplate Page Scheduled Maintenance InstallationTabulated Data Maintenance & Usage Guidelines Test ProceduresSymptom Number Introduction to the Air Brake Charging System Low Air Use High Air UseDiscontinue using this test Symptom What it may indicate What you should doOil Test Card Not a valid test Results Oil on the Outside of the Compressor Oil at air dryer purge/exhaust or surrounding areaOil in Supply or Service Reservoir air dryer installed MaintenanceOil in Supply Insufficient coolant flowOil in Supply or Service Reservoir Oil in ping tank Or compressor disCharge aftercooler Air brake Charging systemAir brake charging system seems slow to build pressure Releases air Compressor builds too much air Air dryer Safety valve releases air TimeLeaks coolant Coolant line fittings NoisyTest 1 Excessive Oil Leakage at Head Gasket Test 2 Air Brake System and Accessory LeakageAction Test 5 Governor Control Line Test 4 Governor MalfunctionTest 6 Compressor Unloader Leakage Page Bendix Air System Inspection Cup Basic Test Information Appendix a Information about the Basic Test Kit Bendix P/NChecklist for Technician Step B Measure the Charging System ContentsStep a Select one Is foundStep D Air Brake System Leakage Test Technical Bulletin Typical P&D, School Bus and Line HaulSystem Leakage Thawing Frozen Air Lines Page