305E CR and 305.5E CR Mini Hydraulic Excavators Hydraulic System Caterpillar


Engine Performance - Test - Engine Speed

Usage:

305.5E FKY

Specification

Table 1
Engine Speed 
Item  305E CR  305.5E CR 
High Idle(1)  2360-2460 RPM  2540-2640 RPM 
Low Idle(1)  1020-1120 RPM  1000 - 1100 RPM 
Auto Idle(1)  1020-1120 RPM  1000 - 1100 RPM 
ECO Mode  -170 ± 50 RPM(2) 
Engine speed with load(3)  2200 RPM(4)  2400 RPM(4) 
(1) No load
(2) Engine speed reduction
(3) Pressure is relieved from both pumps.
(4) Minimum RPM

Introduction

The following test is used to measure engine speed at the flywheel housing.

Required Tools

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

Machine Preparation

  1. Position the machine on level ground.

  2. Stop the engine.

  3. Install a piece of reflective tape on the flywheel of the engine.

  4. Start the engine.

Test Procedure

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

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

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