824G Wheel Tractor, 825G Soil Compactor and 826G Landfill Compactor Hydraulic System Caterpillar

Illustration 1	g00684185

The cylinder is located on the right side of the frame.

Use the following procedures in order to measure the rod drift.

1. Determine the temperature of the hydraulic oil.

2. Raise the blade of the machine until the cutting edge is approximately 25.4 mm (1 inch) off of the ground.

3. Position the blade so the tilt cylinders are extended half of the way.

4. Tilt the blade of the machine so that the right front wheel of the machine is off of the ground. Measure the extended length of the right cylinder rod. Compare the times with the following chart.
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   Table 1

   Cylinder Drift
   Oil Temperature	38 °C (100.4 °F) to 49 °C (120.2 °F)	49 °C (120.2 °F) to 66 °C (150.8 °F)	Above 66 °C (150.8 °F)
   Maximum Permissible Drift	19 mm (0.75 inch)	19 mm (0.75 inch)	19 mm (0.75 inch)
   Time Interval	5 minutes	2.7 minutes	1.7 minutes

The following items are some reasons for excessive cylinder drift.

• Loose connections of oil lines and/or deteriorating hoses between the implement control valve and the cylinders

• Leakage around the piston seals in the cylinders.

• The spool of the implement valve may be worn.

• The implement valve section may be worn.