ENGINE DIAGNOSTIC TEST PROCEDURES Section 6 • LOW IDLE (RPM) 400 Series On-Highway (with Robert Bosch MW Pumps) FROM FORM NO. CGED-365 LOW IDLE (RPM)* 5 A. MANUAL TRANSMISSION- NEUTRAL B. AUTOMATIC TRANSMISSION - DRIVE C. MIXER- DRUM ENGAGED INSTRUMENT GUIDELINE DATA‚ 1st CHECK 2nd CHECK MASTER TACHOMETER *Engine must be at normal operating temperature. p Refer to "Performance Data Guidelines", in this section. Measure Low Idle Speed 1. Assure linkage is adjusted as specified in Operation 3. 2. Set the control lever on the pump to low idle position, Figure   10,   by   moving   the   lever   fully   towards   the governor  housing.  The  lever  must  contact  the  low idle stop screw. IMPORTANT PARKING BRAKE MUST BE ENGAGED WITH MANUAL TRANSMISSION IN NEUTRAL, AUTOMATIC  TRANSMISSION  IN  GEAR  AND MIXER DRUM ENGAGED (IF APPLICABLE). 3. With the engine running check low idle speed using an  accurate  tachometer.    See  "Performance  Data Guidelines" in this section for specifications. 4. If adjustment is required, proceed as directed in Low Idle Adjustment Procedure. Low Idle Speed Adjustment 1. Loosen the lock nut with a 10 mm wrench and raise or   lower   the   low   idle   stop   (bolt)   with   an   8   mm wrench. 2. Raise the stop to increase speed, lower to decrease speed. 3. Tighten   the   lock   nut   when   the   specified   speed   is reached. NOTE:    To  compensate  for  parasitic  loads  which affect low  idle  speed,  the  low  idle  speed  should  be set  slightly  higher  so  engine  speed  will  be  within specifications when the load is applied.  Examples of major parasitic loads are mixer drums and automatic transmissions. Figure 12.  Low Idle Adjustment For Robert Bosch MW Pump CGES-240-4 Printed in United States of America Page 21