305 CR Mini Hydraulic Excavator Hydraulic System Engine Performance - Test - Engine Speed Caterpillar


Engine Performance - Test - Engine Speed
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Table 1
Required Tools    
Part Number     Description     Qty    
9U-7400     Multitach Tool Group     1    

  1. Position the machine on level ground.

  1. Stop the engine.

  1. Install 9U-7400 Multitach Tool Group on the engine.

  1. Start the engine.

  1. Increase the hydraulic oil temperature to 55° ± 5°C (131° ± 9°F).

  1. Read the engine speed display (rpm) on the multitach. Refer to Table 2 for the specifications for engine speed at the desired engine operation.

Table 2
Item     Specifications    
New Rebuild     Service Limit    
No load high idle (1)     2570 ± 50 rpm     2370 to 2620 rpm    
No load low idle     1150 ± 50 rpm     1150 ± 100 rpm    
Maximum speed with load (2)     2400 rpm (3)     2300 rpm (3)     2200 rpm (3)    
No load speed (4)     1150 ± 50 rpm     1150 ± 100 rpm    
( 1 ) Low idle switch in the OFF position
( 2 ) Pressure is relieved from both pumps (stall condition).
( 3 ) Minimum rpm
( 4 ) Low idle switch in the ON position

Note: A New specification is the performance that can be expected for a new machine. A Rebuild specification is the performance that can be expected after rebuilding the components of a system. Performance beyond the Service Limit is an indication of these problems: improper maintenance or adjustment, component wear and failure.

Information System:

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