Danfoss 90 Series Service Manual

Also see for Series 90: Installation Technical information

Contents

Danfoss 90 Series Service Manual Manual pdf 39 page image

W WarningThe following procedure may require the vehicle/machine to be disabled (wheels raised off the ground,work function disconnected, etc.) while performing the procedure in order to prevent injury to thetechnician and bystanders. Take necessary safety precautions before moving the vehicle/machine.Checking switch continuityServo pressure gauge port M4Servo pressure gauge port M5GBtGBt0 - 50 bar [0 - 1000 psi]9/16-1812 N•m [9 lbf•ft]0 - 50 bar [0 - 1000 psi]9/16-1812 N•m [9 lbf•ft]P106 166E1. Install a 50 bar [1000 psi] gauge in each of the two servo cylinder gauge ports (M4 and M5). Attach acontinuity checker to the terminals of the neutral start switch.2. Energize the starter circuit, and start the prime mover.3. While operating at normal speed and with the pump in its neutral (zero flow) position, note thepressure reading on the gauges. Note this reading as the base pressure.4. Slowly move the control handle in one direction while observing the pressure gauges and thecontinuity checker. The switch must open before the pressure on either gauge increases more than 1bar [15 psi] from the base pressure obtained at neutral.5. Slowly move the control handle in the opposite direction. Again, The switch must open before thegauge pressure increases more than 1 bar [14.5 psi] from base pressure.6. Verify continuity again when the control is returned to neutral.7. If the switch does not open at base pressure plus 0 to 1 bar [0 to 14.5 psi] in either direction, stop theprime mover and readjust the eccentric plug as described in the previous section. If the pressuredifference is equal in each direction but greater than 1 bar [14.5 psi], loosen the switch lock nut andturn the switch clockwise 1/12 turn (30°) to increase the sensitivity. Retighten the lock nut andrecheck pressure differences and continuity.8. After verifying proper control and switch operation, stop the prime mover. Remove the continuitychecker and pressure gauges. Reinstall the servo pressure port plugs and reconnect the electricalleads from the machine starter circuit to the NSS. Install and adjust, the external control linkage ifnecessary.Hydraulic displacement control (HDC) and electric displacement control (EDC) adjustmentThe neutral adjustment is the only adjustment that can be made on hydraulic and electric displacementcontrols. All other functions are preset at the factory.Service Manual Series 90 PumpsAdjustments520L0818 • Rev 0101 • August 2015 39