BENDIX BW1421 Manuale Utente

1®Bendix® TU-FLO® 501 Air CompressorSD-01-337DESCRIPTION AND OPERATIONGeneralThe function of the air compressor is to provide and maintainair under pr

10If the compressor uses a ball type main bearing, press theball bearing onto the correct end of the crankshaft. Positionthe ball bearing and the cran

11Position and install the inlet valve guides, then drop the inletvalves in their guides. The inlet valves should be a loosesliding fit in the guides.

126. Never exceed manufacturer’s recommendedpressures.7. Never connect or disconnect a hose or linecontaining pressure; it may whip. Never remove acom

*This guide is only for vehicles that use desiccant air dryers.The guide consists of an introduction to air brake charging systemcomponents, a table s

14Introduction to the Air Brake Charging SystemPowered by the vehicle engine, the air compressorbuilds the air pressure for the air brake system. Thea

15Compressor with up to 25% duty cycleFootnotes:1 With increased air demand the air dryer cartridge needs to be replaced more often.2 Use the drain va

16üAir Brake Charging System TroubleshootingHow to use this guide:1.0 Oil Test CardResultsNot a valid test.Discontinue using this test.Do not use thi

Symptom: What it may indicate: What you should do:172.2 Oil leakingfrom compressor:(a)Excessive leak at head gasket.(b)Leak at bottom cover plate.(c)

184.0 Oil in Supply orService Reservoir(air dryer installed)(If a maintained Bendix®PuraGuard® system filteror Bendix® PuraGuard®QC™ oil coalescing f

Symptom: What it may indicate: What you should do:19(e)Air compressor discharge and/orair dryer inlet temperature too high.(f) Insufficient coolant fl

2FIGURE 1 - VARIOUS COMPRESSOR MOUNTINGSFIGURE 2 - COMPRESSOR NAMEPLATED-2 D-3D-1All Tu-Flo® 501 compressors utilize the engine’s pressurizedoil syste

Symptom: What it may indicate: What you should do:20(i) Poorly filtered inlet air (poor airquality to compressor).(j) Governor malfunction or setting

Symptom: What it may indicate: What you should do:218.0 Oil in ping tankor compressor dis-charge aftercooler.Air brake charging system isfunctioning

Symptom: What it may indicate: What you should do:22(g)Restricted air inlet (not enough airto compressor).ð Check compressor air inlet line forrestric

Symptom: What it may indicate: What you should do:2310.0 Air chargingsystem doesn’tbuild air.(a)Governor malfunction*.(b) Restricted discharge line.(

Symptom: What it may indicate: What you should do:2415.0 Compressorconstantly cycles(compressorremains unloadedfor a very shorttime.)(a)Air brake cha

Symptom: What it may indicate: What you should do:25This guide attempts to cover mostcompressor system problems. Here aresome rare sources of problems

26TestsExterior leaks at the head gasket are not a sign that oil is being passedinto the air charging system. Oil weepage at the head gasket does not

1. Ensure that the governor control line from thereservoir is located at or near the top of thereservoir. (This line, if located near the bottomof the

28NOTES

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

3COMPRESSOR & THE AIR BRAKE SYSTEMGENERALThe compressor is part of the total air brake system, morespecifically, the charging portion of the air b

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

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

32Technical BulletinBulletin No.: TCH-008-021 Effective Date: 11/1/92 Page: 1 of 2Subject: Air Brake System - Cold Weather Operation TipsAs the cold w

33Bulletin No.: TCH-008-021 Effective Date: 11/1/92 Page: 2 of 2High Duty Cycle Vehicles (City Transit Coaches, Refuse Haulers, Etc.)The maximum disch

Technical BulletinBulletin No.: TCH-008-022 Effective Date: 1/1/1994 Page: 1 of 1Subject: Additional Cold Weather Operation Tips for the Air Brake Sys

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BW1421 © 2004 Bendix Commercial Vehicle Systems LLC All rights reserved. 9/2004 Printed in U.S.A.36

4DISCHARGEVALVEPISTONSTROKETO GOVERNORINTAKESTRAINERUNLOADERPLUNGERINLET VALVETO RESERVOIRDISCHARGEVALVEPISTONSTROKETO GOVERNORINTAKESTRAINERUNLOADERP

5PREVENTIVE MAINTENANCERegularly scheduled maintenance is the single mostimportant factor in maintaining the air brake charging system.Refer to Table

6EVERY 24 MONTHS, 7200 OPERATING HOURSOR AFTER EACH 200,000 MILESPerform a thorough inspection as indicated below anddepending upon the results of thi

7A convenient method to indicate the above relationship is touse a metal scribe to mark the parts with numbers or lines.Do not use a marking method th

8OIL PASSINGAll reciprocating compressors currently manufactured willpass a minimal amount of oil. Air dryers will remove themajority of oil prior to

9CrankshaftCheck the crankshaft threads, keyways, tapered ends andall machined and ground surfaces for wear, scores, ordamage. Standard crankshaft jou