Table of Contents
Advertisement
Service Manual
Series T90 Axial Piston Pumps
Adjustments
Hydraulic displacement control (HDC) and electric displacement control (EDC) adjustment
©
Danfoss | March 2020
5. Slowly move the control handle in the opposite direction. Again, The switch must open before the
gauge 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 the
prime mover and readjust the eccentric plug as described in the previous section. If the pressure
difference is equal in each direction but greater than 1 bar [14.5 psi], loosen the switch lock nut and
turn the switch clockwise 1/12 turn (30°) to increase the sensitivity. Retighten the lock nut and
recheck pressure differences and continuity.
8. After verifying proper control and switch operation, stop the prime mover. Remove the continuity
checker and pressure gauges. Reinstall the servo pressure port plugs and reconnect the electrical
leads from the machine starter circuit to the NSS. Install and adjust, the external control linkage if
necessary.
The neutral adjustment is the only adjustment that can be made on hydraulic and electric displacement
controls. All other functions are preset at the factory.
Make this adjustment on a test stand or on the vehicle/machine with the prime mover operating.
W
Warning
The 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 the
technician and bystanders. Take necessary safety precautions before moving the vehicle/machine.
HDC and EDC neutral adjustment
Servo pressure gauge port M4
G
0 - 50 bar [0 - 1000 psi]
B
9/16-20
12 N•m [9 lbf•ft]
t
1. Install a 50 bar [1000 psi] gauge in each of the two displacement control cylinder gauge ports (M4
and M5). Disconnect the external control input (hydraulic or electronic) from the control. Start the
prime mover and operate at normal speed.
2. Loosen the lock nut (M90) with a 10 mm or 13 mm hex wrench.
3. Using a 3 mm or 4 mm internal hex wrench, rotate the adjusting screw (M72) clockwise until the
pressure increases in one of the pressure gauges. Note the angular position of the wrench. Rotate the
neutral adjusting screw counterclockwise until the pressure increases by an equal amount on the
other gauge. Again note the angular position of the wrench.
Servo pressure gauge port M5
G
0 - 50 bar [0 - 1000 psi]
9/16-20
B
12 N•m [9 lbf•ft]
t
M72
I
3 or 4 mm
M90
h
10 or 13 mm
t
7 N•m [5 lbf•ft] or
13 N•m [10 lbf•ft]
P106 167E
AX216086485386en-000101 | 41
Advertisement
Table of Contents
