4 - 78 Z-80/60 Part No. 88619June 2011Section 4 • Repair ProceduresREV EMANIFOLDS8-7Two Wheel Steer and Oscillate Manifold(before serial number 990)The Two Wheel Steer and Oscillate manifold is mounted inside the drive chassis at the square-end of themachine.Index SchematicNo. Description Item Function Torque1 Solenoid valve, 3 position 4 way ....... BA ......... Steer left/right,yellow side steer cylinder .................. 26-30 ft-lbs / 35-41 Nm2 Solenoid valve, 3 position 4 way ....... BB ......... Steer left/right,blue side steer cylinder ..................... 26-30 ft-lbs / 35-41 Nm3 Solenoid valve, 2 position 3 way ....... BC ........ Oscillate cylinder, blue side .............. 26-30 ft-lbs / 35-41 Nm4 Solenoid valve, 2 position 3 way ....... BD ........ Oscillate cylinder, yellow side ........... 26-30 ft-lbs / 35-41 Nm5 Relief valve,750 to 860 psi / 51.71 to 59.3 bar ..... BE ......... Oscillate circuit .................................. 20-25 ft-lbs / 27-34 Nm6 Flow regulator valve,2.3 gpm / 8.7 L/min ............................ BF ......... Blue side steer cylinderextend circuit ..................................... 20-25 ft-lbs / 27-34 Nm7 Flow regulator valve,1.2 gpm / 4.5 L/min(before serial number 928)1.5 gpm / 5.7 L/min ............................ BG ........ Blue side steer cylinder(after serial number 927) retract circuit ..................................... 20-25 ft-lbs / 27-34 Nm8 Check valve ....................................... BH ........ Load sensing circuit,blue side steer cylinder retract ............ 8-10 ft-lbs / 11-14 Nm9 Check valve ....................................... BI .......... Prevents steer cylinder frommoving when not steering ................. 20-25 ft-lbs / 27-34 Nm10 Check valve ....................................... BJ ......... Prevents steer cylinder frommoving when not steering ................. 20-25 ft-lbs / 27-34 NmThis list continues on the next page.
