Engine Performance - Test - Engine Speed
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| 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 2 for the specifications for engine speed at the desired engine operation.
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| Item | Specifications | |||
|---|---|---|---|---|
| New | Rebuild | Service Limit | ||
| No load high idle (1) | 1870 ± 50 rpm (2) | 1670 to 1920 rpm (1) | ||
| 1970 ± 50 rpm (3) | 1770 to 2020 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 rpm |
| ( 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.
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