303.5E2 CR, 304E2 CR, 304.5E2 XTC, 305E2 CR and 305.5E2 CR Mini Hydraulic Excavators Hydraulic System Engine Performance - Test - Engine Speed Caterpillar


Engine Performance - Test - Engine Speed
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1.1. Specification
2.1. Required Tools
3.1. Test Procedure

Specification

Table 1
Engine Speed 
Item  Specification 
303.5E2 304E2  305E2  305.5E2 
High Idle(1)  2370 - 2470 rpm  2360 - 2470 rpm  2360 - 2460 rpm  2540 - 2640 rpm 
Low Idle(1)  1325 - 1425 rpm  970 - 1120 rpm  900 - 1050 rpm  900 - 1050 rpm 
Auto Idle(1)  1325 - 1425 rpm  970 - 1120 rpm  900 - 1050 rpm  900 - 1050 rpm 
(1) No load

Note: A specification is the performance that can be expected for a new machine.

Note: To achieve full rpm listed, uninstall "Power on Demand" using the Cat® Electronic Technician (Cat ET) Service Tool.

Required Tools

Table 2
Required Tools 
Part Number  Description  Qty 
1U-6602  Photo Tach 

Test Procedure

  1. Start the engine.

  2. Position the machine on level ground.

  3. Increase the hydraulic oil temperature to 50° ± 10°C (122° ± 18°F).

  4. Use 1U-6602 Photo Tach to read the engine speed. Refer to Table 1 for the specifications for engine speed at the desired engine operation.

    Note: When checking engine speed, stall the Auxiliary circuit using the thumb wheel

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