Instruments Air Intake Maximum Restriction Values (inH 2 O) Engine Make Pre-EPA07 Engines EPA07 and EPA10 Engines GHG14 Engines Cummins 25 25 25 Mercedes-Benz 22 22 Caterpillar 25 Table 3.4, Air Intake Maximum Restriction Values 02/12/2015 f090514 Fig. 3.8, Air Intake Restriction Indicator, Graduated 05/14/2001 f610551 Fig. 3.10, Ammeter 05/14/2001 f610552 Fig. 3.9, Air Intake Restriction Gauge restriction value equals or exceeds the value shown in Table 3.4 , the air cleaner element needs to be replaced. TRACTOR APPL. PSI Ammeter 05/14/2001 f610549 The ammeter ( Fig. 3.10 ) gauge displays current flow- ing to and from the battery.
When the batteries are charging, the meter needle moves to the positive side of the gauge. When the batteries are being dis- charged, the needle moves to the negative side. A consistent negative reading when the engine is run- ning indicates a possible problem with the charging system. Fig. 3.11, Tractor Application Air Gauge Application Air Pressure Gauge The application air pressure gauge ( Fig. 3.11 ) regis- ters the air pressure being used to apply the brakes, and should be used for reference only. The gauge will not register until the foot pedal is depressed or the hand brake lever is applied.
Air Intake Maximum Restriction Values (inH 2 O) EPA07 and EPA10 Engines Engine Make Pre-EPA07 Engines GHG14 Engines Detroit 20 22 18 3.7