Selective Catalytic Reduction (SCR)

Selective Catalytic Reduction (SCR) emissions - reduction technology with the ability deliver near - zero emissions nitrogen oxides a smog - causing pollutant and greenhouse SCR’ s performance has been proved millions miles real - world truck operations other well long - term field tests the

SCR reduces NOx emissions very low while the same time delivering excellent fuel economy and reliability The system t change the design operation the basic Rather , SCR aftertreatment system which converts NOx the exhaust stream into harmless Modern diesels already use exhaust aftertreatment called diesel particulate control emissions another soot (also known particulate matter

SCR works injecting Diesel Exhaust Fluid (DEF) into the exhaust after the DPF . DEF a simple solution water and DEF works with the heat the exhaust and a catalyst convert NOx into nitrogen and water vapor - two harmless and natural components the air

The end result cleaner air , excellent fuel ficiency and a reliable emissions control system for s modern diesel

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Diesel Engine

Aftertreatment DEF T ank

Aftertreatment DEF Pump

Aftertreatment DEF Dosing Unit

Aftertreatment Diesel Particulate Filter (DPF)

Selective Catalytic Reduction (SCR) Catalyst

Aftertreatment DEF T ank Gauge

Caution

not put diesel fuel the Aftertreatment DEF Diesel sprayed into the hot exhaust along with the DEF , could ignite explosively causing a fire resulting personal injury damage the exhaust

There are two dif ferent configurations for the SCR they are vertical and The horizontal SCR catalyst comes two dif ferent one for the MP7/MP8 engines and lar ger size for the MP10 The vertical SCR catalyst also comes two dif ferent one for the MP7/MP8 engines and lar ger size for the MP10

The MACK SCR system simple and with few consists a Aftertreatment DEF tank positioned near the standard diesel plus a Aftertreatment DEF Aftertreatment DEF Dosing unit and SCR The advantage using DEF that enables the engine use less EGR - - and higher oxygen levels - - for better while meeting the A near - zero NOx emissions requirement g/hp - using DEF , avoid the disadvantages increasing EGR massive This results better fuel economy from your MACK

Diesel Exhaust Fluid (DEF)

Diesel Exhaust Fluid (DEF) a reactant s key the SCR It’ s a aqueous solution urea and water Urea a compound nitrogen that turns ammonia when used a variety perhaps most commonly a fertilizer The fluid not nor dangerous when handled normally However , highly corrosive particularly copper and Read the separate section concerning the handling DEF Only use approved DEF

Diesel Exhaust Fluid (DEF) Handling

When handling DEF solution, important that electrical connectors connected well encapsulated. Otherwise there a risk that the DEF will cause oxidation that cannot removed. W ater compressed air not help, since DEF quickly oxidizes metal. a connector comes into contact with the DEF solution must replaced immediately prevent the DEF solution from creeping further into the copper wiring, which takes place a speed about (2.4 in) per hour .

Caution

When detaching hoses and not spill DEF disconnected DEF spilled a connector , the connector must replaced immediately

Things know about spilled Diesel Exhaust Fluid (DEF) urea solution comes into contact with the rinse with plenty water and remove contaminated urea solution comes into contact with the eyes rinse for several minutes and call for medical help necessary inhaled breathe fresh air and call for medical help necessary not allow the DEF solution come into contact with other the DEF solution spilled onto the vehicle, wipe f the excess and rinse with water . Spilled DEF solution can form concentrated white crystals the vehicle. Rinse f these crystals with water .

The DEF solution not flammable. the DEF solution exposed high temperatures, breaks down into ammonia and carbon dioxide.

The DEF solution highly corrosive certain metals, including copper and aluminium.

Note: not flush DEF spills into the normal drain system.

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DEF spilt onto hot components will quickly vaporize. T urn your face away!

Diesel Exhaust Fluid (DEF) Consumption

DEF consumption related fuel consumption. A highway truck may travel 225 - 300 miles more one gallon DEF . A gauge much like a fuel gauge will indicate the level DEF the tank. A DEF low - level warning will activate when DEF low . a driver runs out DEF completely , vehicle power will reduced derate mode. When the DEF tank refilled, the engine will resume normal power .

Note: DEF tanks are sized for a two one fuel DEF ratio order meet A 2010

Diesel Exhaust Fluid (DEF) A vailability

DEF will available gallon containers, gallon drums, 275 gallon IBC and bulk storage for fleet locations, truck stops and All major truck stops, dealers and distributors will carry DEF For more information DEF and availability please visit the website www

Drive Belt Replacement Intervals

belts squeak squeal, clean with hydraulic brake fluid approved cleaning Replace belts that are severely worn

Rib Cracking

- service poly V - belt will through several phases cracking during its After extended time minor rib cracks may appear , usually one two cracks per This cracking

Belts should not replaced unless the ribs exhibit severe multiple cracking shown below . Multiple cracking will lead rib chunking.

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Belt with Multiple Cracking

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Belt with Severe Cracking and Rib Chunking

Rib Sidewall Glazing

When the belt ribs appear have a shiny surface that hard and brittle, usually indication belt slippage. This attributed inadequate tension and/or extreme temperature. Both these conditions will lead severe cracking and belt failure, often with little advance warning. this occurs, locate the cause and correct before installing a new belt.

Belt W ear

Accelerated wear any part the belt (fabric tensile cord rib rubber) a concern and should investigated for and corrected before installing a new

Possible Causes

Accelerated Belt W ear

• Drive Misalignment Belt performance will adversely fected when misalignment exceeds 1/16 inch for every inches belt span.

• Belt Length Must

• Environmental Conditions T emperature, exposure engine fluids, etc.

• Abrasive Materials Small metal

Foreign Objects

Any object protruding the path the belt drive and contacting the belt will cause damage and eventual failure. Locate the object before installing a new belt. (See )

Noise, V ibration and Harshness (NVH)

Poly V - belt drive systems were designed prevent Noise, V ibration and Harshness (NVH) Field problems, however , which may related NVH causes occasionally occur

Possible Causes

Insuf ficient belt tension may create a high - pitched howl (squeal) rasping sound during engine acceleration

Misalignment may cause a chirping especially near , idle Rigid bracketing accessories a must for reasonably vibration - free belt Some span vibration expected during the range engine speed and accessory

Warning

Failure follow recommended application information and recommended procedures for care maintenance and storage belts may result failure perform properly and may result damage property and serious bodily injury . Make sure the belt selected for any application recommended for that