1.
See Figure 15 Back off max. volume screw to full displacement. Remove max. volume
screw assembly.
2.
Remove bolts holding cap to pump.
3.
Remove isolation valve (29) from block (28). Remove plug (15) and attached parts.
Remove spring (11) and spool (18).
4.
Remove adj. plug (2) and attached parts. Remove seal piston (5). Note: a 10-24 screw
may be used to assist in pulling the piston. Remove spring (7) and cone (8).
5.
Do not remove sleeve in body (1). Sleeve is pressed into cap and finished to size. If
sleeve or cap is worn, replace the cap-sleeve assembly (1).
6.
Examine seat (10) for wear. Do not remove unless damaged.
1.
Install Avseal plugs (9) and orifice (35) in body.
2.
Press seat (10) into bore squarely against shoulder in bore.
3.
Install spool (18) into bore as shown. Install spring (11) over end of spool. Install O-ring
(6) on seal (16). Lubricate and install into plug (15). Install plug (15) into cap. Install screw
(3), nut (4) and acorn nut (17).
4.
Install O-ring (6) on seal piston (5).
5.
Lubricate O-ring and install cone (8), spring (7) and seal piston into bore in cap (1),
being careful that cone enters seat (10). Install remaining parts in body (1). Torque plug (36)
to 60 Nm. Torque plug (21) to 35 Nm.
6.
Install O-rings (29-a) and (29-b) on valve (29). Observe that backup ring on inside
groove is toward the outside, the one on the middle groove is toward the inside, and the one
on the outside groove is toward the outside. Lubricate and install valve (29) in block (28),
being careful to avoid damaging the O-rings. Torque to 67.8 Nm.
7.
Install O-ring (32) on plug (31). Install plug in block (28). Install plug (22) in adapter.
8.
Note proper location for cap on pump. Install O-rings on interface between cap and
pump control pad. Install O-rings (26) in block (28).
9.
Install on pump control pad, guiding the control piston into the bore. Install maximum vol-
ume stop parts.
10. Torque mounting bolts to 102 Nm.
Connect pump to a circuit with system flow metered by a needle valve or suitable metering
valve. Connect load sensing line downstream of the metering valve. Connect gage to pump
output, and to load sensing line, capable of measuring 20,7 bar pressure difference at 345
bar.
Connect a relief valve downstream of the metering valve, and a flowmeter to measure pump
flow.
1.
Adjust maximum volume stop to full displacement by backing off stop till there is no con-
tact with the control piston.
2.
Turn compensator adjustment screw (25) CCW until there is no contact with spring, then
adjust 1/2 turn CW after contact is made with spring.
3.
Turn differential adjustment screw (3) CCW until there is no contact with spring, then
adjust 1/2 turn CW after contact is made with spring.
4.
Open metering valve and set relief valve at 35 bar.
5.
Start prime mover. Pump should be at full displacement at 35 bar.
6.
Increase system relief valve until compensator de-strokes pump to zero displace-
ment. Set compensator to 103 bar.
7.
Close the metering valve. Check the pressure difference from pump output to load sens-
ing line. Using the differential adjustment, set this pressure difference to 24,1 ± 1.7 bar or
shop order requirement.
8.
Set the compensator to 207 bar, and 345 bar. At each condition, increase the system
pressure until the pump fully de-strokes. At no time should the system pressure vary more
than 10,3 bar from the compensator setting. The control should be steady and stable at all
conditions.
9.
Open the metering valve to 454 ± 3,8 l/m flow at 69 bar. Raise the relief valve setting till
the pump compensates at 345 bar. Reduce relief valve setting 13,8 bar. Flow to return to
454 ± 7,4 l/m.
10. Check pressure differential at 69, 138, and 207 bar ± 6,9 bar. Pressure differential to
remain the same as in (7) above.
11. Set the flow to 37.8 l/m at 69 bar. Observe flow as pressure is varied from 34,5 bar to
331 bar. Flow shall not vary by more than ±7,6 l/m).
12. Repeat at 113 ± 3,78 l/m.
13. Set load relief valve at 138 bar. Check pressure differential at 37,8, 114, and 189 l/m ±
7,6 l/m. Pressure differential shall be the same as in (7) above.
14. Set compensator adjustment to the required setting, or 345 bar if not otherwise
noted.
LOAD SENSING CONTROL
LOAD SENSING CONTROL
DISASSEMBLY
ASSEMBLY
TEST AND ADJUSTMENT
34
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