330D Forest Machine Hydraulic System Caterpillar

Engine Performance - Test - Engine Speed

Usage:

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Table 1
Required Tools
Part Number	Description	Qty
9U-7400	Multitach Tool Group	1

Position the machine on level ground.

Stop the engine.

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

Start the engine.

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

Read the engine speed display (rpm) on the multitach. Refer to Table 3 for the specifications for engine speed at the desired engine operation.

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Table 2
Item	Specifications
Item	New	Rebuild	Service Limit
No load high idle ⁽¹⁾	1880 ± 50 rpm ⁽²⁾		1680 to 1930 rpm ⁽¹⁾
No load high idle ⁽¹⁾	1980 ± 50 rpm ⁽³⁾		1780 to 2030 rpm ⁽³⁾
No load low idle	800 ± 50 rpm		800 ± 100 rpm
Maximum speed with load ⁽⁴⁾	1720 rpm ⁽⁵⁾	1670 rpm ⁽⁵⁾	1620 rpm ⁽⁵⁾
No load speed ⁽⁶⁾	1300 ± 50 rpm		1300 ± 100 rpm

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^( 1 )	AEC switch in the OFF position
^( 2 )	Three seconds after the engine speed dial was placed at position "10"
^( 3 )	Engine rpm within three seconds after the engine speed dial was placed at position "10"
^( 4 )	Pressure is relieved from both pumps (stall condition).
^( 5 )	Minimum
^( 6 )	AEC 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.