LT3-00032-2-A - DDKS Industries, hydraulic components distributor

TEST PROCEDURE
BASIC PUMP TEST
Mount pump on test stand. Connect system lines and internal vane pump inlet to
pump. Fill pump case with clean oil. Dry all oil from pump to permit checking for
external leaks.
Start electric motor. Jog several times before continuous running.
Rotate pump input control shaft. The servo control should control pump displacement
through its full range. Set pump displacement for full volume, and adjust system pressure
for 1000 psi, 69 bar. Check and record system flow and case drain flow with cam
above and below center. Monitor loop temperature
Maximum system flow
Maximum case drain flow
24 series 194 gpm, 734 Lpm
30 series 241 gpm, 912 Lpm
24 series 4.5 gpm, 17 Lpm
30 series 5.5 gpm, 21 Lpm
Back out compensator adjusting screw until unit is fully compensated count number
of turns. Observe volume indicator and stroke rotary servo input shaft from full to full
position on each side of center. Indicator should remain on or very near zero position
“0”. If compensator functions normally, return compensator adjusting screw to its
original position and proceed with next step.
Caution: Do not over tighten cap screw.
Cycle pump at 10 seconds intervals - full volume above center to full volume below
center* - as follows:
10 minutes at 1000 psi, 69 bar
10 minutes at 2500 psi, 172 bar
10 minutes at 5000 psi, 345 bar
Adjust system pressure to 5000 psi, 345 bar and set pump displacement for full
volume. Check and record system flow and case drain flow above and below center.
*Pumps with screw adjustment controls do not need to be cycled.
Minimum system flow
Maximum case drain flow
24 series 160 gpm, 606 Lpm
30 series 220.69 gpm, 385 Lpm
24 series 12 gpm, 45,4 Lpm
30 series 13 gpm, 49 Lpm
Install special adjusting screw over modulating pin in valve block. Center pump, adjust
special adjusting screw to reach 600 psi, 41,4 bar servo pressure. Read case drain
flow as internal vane pump flow. See chart, first basic pump test.
CONTROL TEST
Please refer to control service manual No. S1-AM030 for control information.
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