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1. See Figure 3. Back off max. volume screw or handwheel to full displacement.
Remove max. volume screw or handwheel assembly.
2. Remove bolts holding cap to pump.
3. Remove plug (15) and attached parts. Remove spring (11) and spool (18).
4. Remove adjusting 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 O-ring (14 in bottom of bore as shown. 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 (13) on plug (15). Install plug (15) into cap. Install
screw (3) and nut (4).
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. Torque plug (12) to 90
ft-lbs, 122 N m. Torque plug (21) to 50 ft-lbs, 68 N m. Torque plug (28) to 11 ft-lb, 15
Nm.
6. Note proper location for cap on pump. Install O-rings on interface between cap and
pump control pad.
7. Install cap on pump control pad, guiding the control piston into the bore. Install
maximum volume stop assembly.
8. Torque mounting bolts to 75 ft-lbs, 102 N m.
Compensator is to be tested on pump. Adjust maximum volume stop to full displace-
ment by backing off stop till there is no contact with the control piston.
1. Install gages on system pressure and on compensator vent, port “V”.
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. System relief valve should be set at 500 psi, 35 bar. If testing on application, apply
a load to pump.
5. Start prime mover. Pump should be at full displacement at 500 psi, 35 bar.
6.
Increase system relief valve or load until compensator de-strokes pump to zero dis-
placement. Set compensator to 1500 psi, 103 bar.
7. Adjust compensator differential spool pressure to 200 psi, 13,8 bar. This is accom-
plished by adjusting the differential screw until the difference in pressure readings
between the system pressure and compensator vent gages installed in the compensator
cap is 200 psi, 13,8 bar. (It may be necessary to change differential to gain stability. Use
caution when exceeding 250 psi, 17 bar to avoid spring going solid, preventing compen-
sator action.)
8. Set the compensator to 3000 psi, 207 bar, 6000 psi, 414 bar, and 7250 psi, 500 bar.
9. 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 compen-
sator setting. The control should be steady and stable at all conditions.
10. Reduce pressure to 150 psi, 10,3 bar below the compensator setting. Pump should
return to full stroke. Repeat two or more times. Compensator setting should be repeat-
able.
11. Set compensator adjustment to the required setting, or 6000 psi, 414 Bar if not oth-
erwise noted. Install cap (17) on differential adjustment.
PRESSURE COMPENSATOR
COMPENSATOR DISASSEMBLY
ASSEMBLY
COMPENSATOR TEST AND
ADJUSTMENT
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