Volvo EC700B Hydraulic System Valve Adjustment Guide

This instruction show you guide on how to perform valve adjustment for Volvo EC700B excavator hydraulic system.

 

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Procedures:
1)- Loosen the hexagon screws that hold the leaf springs.
The screws are to be loosened on all six cylinders.
- Rotate the cam shaft to adjust the rocker arms.
- The dash marking on the cam shaft must be positioned between the two dash marks on the bearing housing.

- Adjust all rockers(in,ex,injector) for that cylinder per number! Cylinder 1
shown.
2)Adjust the inlet rocker arm clearance.
- Set the clearance between the rocker arm ball socket and the valve caliper to 0.3 mm using the adjusting screw on the rocker arm and a feeler gauge.
(Torque to tighten the nut : 38 Nm)
A : Inlet
B : Injector
C : Exhaust
3)- Eliminate the clearance between the adjusting screw and the injector by turning the adjusting screw.
- Turn the adjusting screw another 240º (4 hexagons : 180 + 60).
- Torque to tighten the nut : 52 Nm
4)- The valve caliper must be balanced before adjusting the exhaust rocker arm clearance.
- Adjust the clearance between the exhaust rocker arm ball socket and the valve caliper to 0.60mm, using
the adjusting screw on the rocker arm and a feeler gauge.
- Torque to tighten the nut : 38 Nm
5)- Loosen the nut on the brake rocker arm.
- Place a dial indicator on the feeler gauge, close to the ball socket, and set the dial indicator to zero.
- Tighten the adjusting screw with a hexagon key until the dial indicator shows that the valve yoke has