The operator sound pressure levels for the Backhoe Loader are measured at the recommended operating engine speed of 2100 rpm.
The operator sound exposure Leq (equivalent sound pressure level) measured according to the work cycle procedures specified in "ANSI/SAE J1166May90" is 79 dB(A), for the cab offered by Caterpillar, when properly installed and maintained and tested with the doors and windows closed.
The operator sound pressure level measured according to the procedures specified in "SAE J919Jun86" is 80 dB(A), for the cab offered by Caterpillar, when properly installed and maintained and tested with the doors and windows closed and with the machine in middle gear range and moving.
The exterior sound pressure level for the standard machine measured at a distance of
| SOUND LEVELS | ||
| Model | Machines without A/C | Machines with A/C |
| 420D, 430D | 81 dB(A) | 83 dB(A) |
The operator sound pressure level is measured according to dynamic test procedures and conditions specified in "ISO 6396" or "95/27/EC". The operator sound pressure level is measured at the recommended operating engine speed of 2100 rpm.
As manufactured by Caterpillar, this machine's exterior sound power level meets the criteria specified in the European Directives noted on the certificate of conformance and the accompanying labels.
The hands and arms are exposed to a weighted root mean square acceleration that is less than 2.5 m/sec2.
The whole body is exposed to a weighted root mean square acceleration that is less than 0.5 m/s2.
Measurements are obtained on a representative machine using the procedures in the following standards:
- "ISO 2631/1"
- "ISO 5349"
- "SAE J1166"