Component Adjustments; Charge Pressure Relief Valve Adjustment - Sauer Danfoss 51 Series Manual

GROUP 3025

6 COMPONENT ADJUSTMENTS

WARNING
It is recommended that the auger be
disconnected from the torque hubs
while performing pump adjust-
ments to prevent possible injury to
the technician or bystanders. Dis-
connect the auger from the torque
hubs, support the auger with a lift
fixture and remove the spacers from
each hub/auger junction. Refer to
group 3001-- 7 High Speed Blower.
6.1

Charge Pressure Relief Valve Adjustment

Correct charge pressure must be maintained under all
conditions of operation to maintain pump control per-
formance in closed loop systems.
To measure and adjust motor charge pressure:
(1) Install a 0 to 60 bar or 0 to 1000 psi pressure
gauge in the motor charge pressure gauge
port. Install a gauge to measure case pres-
sure.
(2) Operate the system with the motor at normal
operating speed and the pump at half stroke
(forward or reverse) when measuring motor
charge pressure.
(3) In most applications the motor charge relief
valve is set to 2 to 4 bar (29 to 58 psi) below
3025- -9A, Page 8
the setting of the pump charge relief valve
(measured with the pump in the "neutral" or
zero---angle position). This setting assumes
a reservoir temperature of 50
and is referenced to case pressure.
(4) Adjust the charge pressure by loosening the
1
locknut with a 1---
the adjustment plug with a large screwdriver
(Fig. 4). Clockwise rotation of the plug in-
creases the setting, and counterclockwise
rotation decreases the setting at a rate of
approximately 3.4 bar (50 psi) per turn.
Figure 4. Charge Pressure Relief Adjustment
(5) Once the desired pressure is reached, re-
tighten the locknut to 38 ft. lbs. (52 Nm), re-
move the gauges and reinstall the port
plugs.
HYDRAULIC PUMP
o o
C (122 F),
/ " wrench and turning
16