<\/span><\/h2>\nMeasure function cycle time at the specified oil temperature, engine speed, power mode, and linkage position. A slow boom in both directions may indicate pump flow, restriction, spool travel, or cylinder friction. Normal speed with excessive neutral drift focuses attention on load-holding leakage rather than general pump output.<\/p>\n
Compare left and right boom cylinders only if the machine uses a matched pair and the manual permits measurement. Unequal rod temperature, leakage, or stroke can reveal imbalance, but do not loosen lines. Check diagnostic codes and pilot pressure before adjusting a main or port relief valve.<\/p>\n
For lifting concerns, confirm the permitted configuration using the mini excavator lift chart guide<\/a>. A lift chart does not authorize operation with a drifting circuit. Remove the machine from lifting service until control meets specification.<\/p>\n<\/span>Manufacturer cylinder-drift demonstration<\/span><\/h2>\nThe following Caterpillar video shows hydraulic technical analysis tests, including cylinder drift and cycle-time measurements. It demonstrates the discipline of setting temperature, linkage position, timing, and measurement points. Values for the machine in the video must not be applied to another excavator.<\/p>\n