AD07.15-G-7001-06B | MR. (PLD) test of hydraulic system fuel return flow quantity |
| Test procedure | Measuring instrument/test connection | Operation/ Preconditions | Specified value | Possible cause/ Remedy | ||
1.0 | Fuel return flow quantity at outlet of fuel filter housing Attach testing and measuring equipment to low-pressure fuel circuit | Engine: starting Wait until fuel flows out practically free of bubbles at the measuring line Idle speed: Model 405.05 800 rpm Model 405.10/12/20/22, Model 437.42/43 720 rpm Model 437.46 850 rpm Measuring time > 1 minute Maximum governed rpm: 2500 rpm Measuring time > 30 s Measuring point: Overflow valve |
0.3 l/min. 0.3 l/min. | Fuel return flow quantity at overflow valve too low and within tolerance range at outlet of fuel filter housing Fuel return flow quantity at overflow valve too low and too high at outlet of fuel filter housing | |||
1.1 | Fuel return flow quantity at overflow valve | Engine: starting Idle speed: Model 405.05 800 rpm Model 405.10/12/20/22, Model 437.42/43 720 rpm Model 437.46 850 rpm Measuring time > 1 minute Maximum governed rpm: 2500 rpm Measuring time > 30 s |
0.9 up to 2.7 up to | Fuel return flow quantity at overflow valve within tolerance range and cannot be measured at outlet of fuel filter housing Fuel return flow quantity at overflow valve and at outlet of fuel filter housing within tolerance range Fuel return flow quantity at overflow valve too low and at outlet of fuel filter housing | |||