H0021 Piston Torquing Instructions Compact Extra

14 July 2005 PDF File

Hydraulics

Version 2

 

Torquing Procedure:

  1. Torque to the setting in the table below to establish an initial zero point.
  2. Torque by angle as per the table below from the zero point.
  3. Untorque.
  4. Torque to the same setting as in the table below.
  5. Retorque to the same setting as in the table below.

Mark/model

Initial Torque Setting

Initial Torque Angle

HC-25801

SB 360 Bottom arm and early Top arm cylinders

70 Nm

65-68 degrees

HC-25900 SB 330

60 Nm

58-60 degrees

HC-25806 SB 300

50 NM

70-73 degrees

Pressure Testing Procedure:

  1. Cycle in and out (at least 3 times) to remove all trapped air.
  2. Test at 150 psi. pressure (in both directions) for pressure drop and leaks.
  3. Test at 3,000 psi. pressure (in both directions) for pressure drop and leaks.
  4. Test on the retract side with a strock restricting spacer placed between the head and the eye at 4,800 psi; do not go any higher as the piston rod could be over stressed.