TSE DPT60, Owner'S Manual

Page: 271 / 459

42
Series 90 Inspections and Adjustments
Checking Continuity of NSS (System Pressure Gauges
installed on far side)
NSS
Loosening the NSS Lock Nut
90000253
90000870
90000832E
NSS Deadband Adjustment (Conditions ii & iii)
The NSS deadband must be wide enough so the NSS will
not open within the control shaft “free-play” area, and it
must be narrow enough so the NSS will open before the
unit builds 7 bar (100 psi) differential system pressure in
either direction.
1. Install two 1000 bar (10 000 psi) pressure gauges in
the system pressure gauge ports M1 and M2.
2. Using two 1-1/8 inch wrenches, hold the neutral start
switch from turning and loosen the locknut.
3. Disconnect the external control linkage and make
certain the control shaft is in its “neutral” position.
4. Attach a continuity checker to the terminals of the
switch. With the control shaft in its “neutral” position,
turn the switch clockwise (CW) until electrical conti-
nuity is broken, then turn the switch counterclockwise
(CCW) until electrical continuity is obtained. Turn the
switch counterclockwise (CCW) an additional 1/4
turn (90°) after continuity has been obtained.
5. Hold the switch in place and tighten the locknut to
27 Nm (20 lbf•ft) torque.
6. With the continuity checker attached to the switch,
rotate the control handle (or the control shaft) in each
direction to assure continuity is broken when the
control is not in the “neutral” position.
7. If continuity is obtained in “neutral” and satisfactorily
interrupted in each direction, proceed to check the
switch with the prime mover running. The switch
must open
before the unit builds 7 bar (100 psi)
differential system pressure in either direction.
If the switch opens after the unit builds system
pressure in either direction, loosen the switch lock
nut and turn the switch clockwise (CW) 1/12 turn
(30°). Tighten the switch lock nut and recheck the
switch operation. Repeat this procedure if neces-
sary.
8. If continuity is not interrupted with an equal move-
ment of the control handle in each direction, turn off
prime mover, remove the pressure gauges, and
continue with the next section.
9. If neutral start switch operation is satisfactory, turn
off the prime mover, remove the pressure gauges,
and reconnect the external control linkage.
Switch Pin
1-1/8 in. hex wrench
Torque: 27 Nm (20 lbf•ft)
Switch Cam
Neutral Start Switch
Switch Lock Nut
Control Shaft