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1.
See Figure 15 Back off max. volume screw to full displacement. Remove max. vol-
ume 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 (19) 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 piston (16). Lubricate and install into plug (15). Install O-ring (14 in bore as
shown. Install O-ring (13) on plug (15) and install plug into cap. Install screw (3) and nut (4).
Cap (17) will be installed after test and final adjustment.
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 (12)
to 90 ft-lb.,122 Nm. Torque plug (21) to 50 ft-lb., 68 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 50 ft-lb., 68 Nm.
7.
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).
8.
Install block (28) on cover (1) with M24 x 85 mm lg mounting bolts. Install on pump
control pad, guiding the control piston into the bore.
9.
Install maximum volume stop. Torque mounting bolts to 75 ft-lb., 102 Nm.
Connect pump to a circuit with system flow metered by a needle valve or suitable metering
valve. Connect load sensing line from downstream of the metering valve to load sensing
port “LS”. Connect gage to pump output, and to load sensing line, capable of measuring
300 psi, 20,7 bar pressure difference at 5000 psi, 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 500 psi, 35 bar.
5.
Start prime mover. Pump should be at full displacement at 500 psi, 35 bar.
6.
Increase system relief valve until compensator de-strokes pump to zero displace-
ment. Set compensator to 1500 psi, 103 bar.
7.
Close the metering valve. Check the pressure difference from pump output to load
sensing line. Using the differential adjustment, set this pressure difference to 350 ± 25 psi,
24 ± 1,7 bar or shop order requirement.
8.
Set the compensator to 3000 psi, 207 bar, and 5000 psi, 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 150 psi, 10,3 bar from the compensator setting. The control should
be steady and stable at all conditions.
9.
Open the metering valve till pump reaches full flow at 1000 psi, 69 bar. Reduce flow by
10 gpm, 38 L/m. Raise the relief valve setting till the pump compensates at 5000 psi, 345
bar. Reduce relief valve setting 200 psi, 14 bar. Flow to return to previous value ± 2 gpm,
7,6 L/m.
10. Check pressure differential at1000, 2000, and 3000 psi ±100 psi (69, 138, and 207 bar
± 6,9 bar). Pressure differential to remain the same as in (7) above.
11. Set the flow to 10 gpm, 38 l/m at 1000 psi, 69 bar. Observe flow as pressure is varied
from 500 psi to 4800 psi (34.5 bar to 331 bar). Flow shall not vary by more than ±2 gpm,
7.6 l/m.
12. Set load relief valve at 2000 psi,138 bar. Check pressure differential at 10 and 30 gpm
±2 gpm (38 and 114 ± 7,6 l/m). Pressure differential shall be the same as in (7) above.
13. Set compensator adjustment to the required setting, or 5000 psi, 345 bar if not oth-
erwise noted. Install cap on differential adjustment.
LOAD SENSING CONTROL
LOAD SENSING CONTROL
DISASSEMBLY
ASSEMBLY
TEST AND ADJUSTMENT
34
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