Bendix-commercial-vehicle-systems BA-922 COMPRESSOR User Manual

FIGURE 1 - BA-922® COMPRESSORDESCRIPTIONThe function of the air compressor is to provide and maintain air under pressure to operate dev

109. Install the balance piston spring (5) in the unloader piston (7), then install the small diameter of the balance piston (4) through the

11Advanced Troubleshooting Guide for Air Brake CompressorsAir brake charging system: Slow build (9.0) ...19 - 20 D

12Introduction to the Air Brake Charging SystemPowered by the vehicle engine, the air compressor builds the air pressure for the air brake

13Compressor with up to 25% duty cycleFootnotes: 1. With increased air demand the air dryer cartridge needs to be replaced more often.2.

14Air Brake Charging System Troubleshooting1.0 Oil Test Card ResultsNot a valid test.Discontinue using this test. Do not use this card test to diagno

15(a) Symptom: What it may indicate: What you should do:2.2 Oil leaking from compressor:(a) Excessive leak at head gasket. (b) Leak at bottom cov

16Symptom: What it may indicate: What you should do: 4.0 Oil in Supply or Service Reservoir(air dryer installed)(If a maintained Bendix® PuraGuard

17Symptom: What it may indicate: What you should do: (e) Air compressor discharge and/or air dryer inlet temperature too high.(f) Insufficie

18Symptom: What it may indicate: What you should do: (i) Poorly filtered inlet air (poor air quality to compressor).(j) Governor malfunctio

19Symptom: What it may indicate: What you should do:8.0 Oil in ping tank or compressor dis-charge aftercooler.Air brake charging system is function

2AIR INTAKE (LOADED)During the piston down stroke, a vacuum is created in the cylinder bore above the piston. The vacuum causes the inlet re

20Symptom: What it may indicate: What you should do: (g) Restricted air inlet (not enough air to compressor). Check compressor air inlet line for

21Symptom: What it may indicate: What you should do: 10.0 Air charging system doesn’t build air. (a) Governor malfunction*. (b) Restricted discharg

22Symptom: What it may indicate: What you should do: 15.0 Compressor constantly cycles (compressor remains unloaded for a very short time.)(a) A i

23Symptom: What it may indicate: What you should do: This guide attempts to cover most com-pressor system problems. Here are some rare sources of

24TestsExterior leaks at the head gasket are not a sign that oil is being passed into the air charging system. Oil weepage at the head gasket does no

251. Ensure that the governor control line from the reservoir is located at or near the top of the reservoir. (This line, if located near th

26HighSTART BASIC TESTIs this atransit vehicle, bulkunloader, or has morethan 5 axles?YES, this is a highair usevehicle.NO, this is a low airuse vehic

27Footnote 1: Note: Typical air dryer cartridge replacement schedule is every 3 yrs/ 300K miles for low air use vehicles and every year/100K miles for

28Park the vehicle on level ground and chock wheels. Build system pressure to governor cut-out and allow the pressure to stabilize for one minute. 1:

29Technical Bulletin Bulletin No.: TCH-008-021 Effective Date: 11/1/92 Page: 1 of 2Subject: Air Brake System - Cold Weather Operation Ti

3LUBRICATIONThe vehicle's engine provides a continuous supply of oil to the compressor. Oil is routed from the engine to the compressor oil

30Bulletin No.: TCH-008-021 Effective Date: 11/1/92 Page: 2 of 2High Duty Cycle Vehicles (City Transit Coaches, Refuse Haulers, Etc.) T

31Technical Bulletin Bulletin No.: TCH-008-022 Effective Date: 1/1/1994 Page: 1 of 1Subject: Additional Cold Weather Operation Tips for

32BW2398 © 2005 Bendix Commercial Vehicle Systems LLC. All rights reserved. 10/2005. Printed in U.S.A.

4A supply of clean air is one of the single most important factors in compressor preventive maintenance. Since the BA-922® compressor receives supply

5IMPORTANT NOTEReplacement air governors must have a minimum cut-in pressure of 105 psi. The cut-in pressure is the lowest system press

6While it is possible to test for inlet, discharge, and unloader piston leakage, it may not be practical to do so. Inlet and discharge valve leakag

7technician must assess the installation and determine the correct course of action.These instructions are general and are intended to be a gui

84. Remove the discharge and inlet fittings, if applicable, and note their position on the compressor to aid in reassembly.Note: If a cylinder head m

9INSPECTION OF PARTS CYLINDER HEAD & VALVE PLATE 1. Carefully inspect the cylinder head gasket surfaces for deep gouges and nicks. If detected,