Parker P1 Series - Compensator Assembly

Parker Hannin Corporation
Hydraulic Pump and
Power Systems Division
Marysville, Ohio USA
Bulletin HY28-2665-02/SVC/EN
Medium Pressure Axial Piston Pumps
P1/PD Maintenance
33
COMPENSATOR ASSEMBLY
NOTE: instructions are for load
sense compensator. for other
compensator types disregard steps
related to extra spool assembly.
Carefully clean and dry all parts prior to assembly. Use caution to insure that
spools and other parts are not damaged during cleaning process. Use clean oil to
lubricate seals and spools for easier assembly.
1. Remove and discard all o-rings. Install new o-rings on SAE boss plugs and
seal pistons.
2. Apply a light film of oil to the o-ring on the main compensator seal piston.
Install the main compensator seal piston in the main compensator spring
cap.
3. Place inner compensator spring on seal piston. Install the outer compensator
spring over the inner spring on the seal piston. Position the spring seat over
the springs. Insert this assembly into the main compensator housing bore.
Torque the main compensator spring cap to 169-183 Nm (125-135 ft.-lb.).
4. Apply a light film of oil on the main compensator spool (the longer of the 2
spools). Insert the spool into the spool bore opposite the main compensator
spring assembly in the compensator body. The rounded end of the spool
should be installed first so it will contact the
spring seat. Install a new o-ring
on the hardened SAE boss fitting and place it into the port. Torque fitting to 4
± 0.5 Nm (37 ± 5 in-lb).
5. Apply a light film of oil to the o-ring on the load sense seal piston. Install the
load sense compensator seal piston seat in the load sense spring cap.
Install the load sense spring over the seal piston. Position the spring seat
over the spring. Install this assembly into the load sense bore of the
compensator housing. Torque the load sense spring cap to 35-38 Nm (26-28
ft. lb.).
6. Apply a light film of oil to the load sense compensator spool (the shorter of
the 2 spools). Insert the spool into the spool bore opposite the load sense
spring assembly. The spool should be installed with the rounded end in first
so it will contact the load sense spring seat. Install a new o-ring on the
hardened SAE boss fitting and place it into the port. Torque fitting to 4 ± 0.5
Nm (37 ± 5 in-lb).
7. Install o-rings on remaining SAE boss fittings and install into housing.
Torque SAE-2 fittings to 4 ± 0.5 Nm
(37 ± 5 in-lb).
Load Sense Spool
Main Compensator Spool
Main Outer Spring
Load Sense
Spring
Main Compensato
r
Inner Spring
COMPENSATOR ASSEMBLY
NOTE: instructions are for load
sense compensator. for other
compensator types disregard steps
related to extra spool assembly.
Carefully clean and dry all parts prior to assembly. Use caution to insure that
spools and other parts are not damaged during cleaning process. Use clean oil to
lubricate seals and spools for easier assembly.
1. Remove and discard all o-rings. Install new o-rings on SAE boss plugs and
seal pistons.
2. Apply a light film of oil to the o-ring on the main compensator seal piston.
Install the main compensator seal piston in the main compensator spring
cap.
3. Place inner compensator spring on seal piston. Install the outer compensator
spring over the inner spring on the seal piston. Position the spring seat over
the springs. Insert this assembly into the main compensator housing bore.
Torque the main compensator spring cap to 169-183 Nm (125-135 ft.-lb.).
4. Apply a light film of oil on the main compensator spool (the longer of the 2
spools). Insert the spool into the spool bore opposite the main compensator
spring assembly in the compensator body. The rounded end of the spool
should be installed first so it will contact the
spring seat. Install a new o-ring
on the hardened SAE boss fitting and place it into the port. Torque fitting to 4
± 0.5 Nm (37 ± 5 in-lb).
5. Apply a light film of oil to the o-ring on the load sense seal piston. Install the
load sense compensator seal piston seat in the load sense spring cap.
Install the load sense spring over the seal piston. Position the spring seat
over the spring. Install this assembly into the load sense bore of the
compensator housing. Torque the load sense spring cap to 35-38 Nm (26-28
ft. lb.).
6. Apply a light film of oil to the load sense compensator spool (the shorter of
the 2 spools). Insert the spool into the spool bore opposite the load sense
spring assembly. The spool should be installed with the rounded end in first
so it will contact the load sense spring seat. Install a new o-ring on the
hardened SAE boss fitting and place it into the port. Torque fitting to 4 ± 0.5
Nm (37 ± 5 in-lb).
7. Install o-rings on remaining SAE boss fittings and install into housing.
Torque SAE-2 fittings to 4 ± 0.5 Nm
(37 ± 5 in-lb).
Load Sense Spool
Main Compensator Spool
Main Outer Spring
Load Sense
Spring
Main Compensator
Inner Spring
Compensator Procedures
COMPENSATOR ASSEMBLY
NOTE: instructions are for load
sense compensator. for other
compensator types disregard steps
related to extra spool assembly.
Carefully clean and dry all parts prior to assembly. Use caution to insure that
spools and other parts are not damaged during cleaning process. Use clean oil to
lubricate seals and spools for easier assembly.
1. Remove and discard all o-rings. Install new o-rings on SAE boss plugs and
seal pistons.
2. Apply a light film of oil to the o-ring on the main compensator seal piston.
Install the main compensator seal piston in the main compensator spring
cap.
3. Place inner compensator spring on seal piston. Install the outer compensator
spring over the inner spring on the seal piston. Position the spring seat over
the springs. Insert this assembly into the main compensator housing bore.
Torque the main compensator spring cap to 169-183 Nm (125-135 ft.-lb.).
4. Apply a light film of oil on the main compensator spool (the longer of the 2
spools). Insert the spool into the spool bore opposite the main compensator
spring assembly in the compensator body. The rounded end of the spool
should be installed first so it will contact the spring seat. Install a new o-ring
on the hardened SAE boss fitting and place it into the
port. Torque fitting to 4
± 0.5 Nm (37 ± 5 in-lb).
5. Apply a light film of oil to the o-ring on the load sense seal piston. Install the
load sense compensator seal piston seat in the load sense spring cap.
Install the load sense spring over the seal piston. Position the spring seat
over the spring. Install this assembly into the load sense bore of the
compensator housing. Torque the load sense spring cap to 35-38 Nm (26-28
ft. lb.).
6. Apply a light film of oil to the load sense compensator spool (the shorter of
the 2 spools). Insert the spool into the spool bore opposite the load sense
spring assembly. The spool should be installed with the rounded end in first
so it will contact the load sense spring seat. Install a new o-ring on the
hardened SAE boss fitting and place it into the port. Torque fitting to 4 ± 0.5
Nm (37 ± 5 in-lb).
7. Install o-rings on remaining SAE boss fittings and install into housing.
Torque SAE-2 fittings to 4 ± 0.5 Nm (37 ± 5 in-lb).
Load Sense Spool
Main Compensator Spool
Main Outer Spring
Load Sense
Spring
Main Compensator
Inner Spring
COMPENSATOR ASSEMBLY
NOTE: instructions are for load
sense compensator. For other
compensator types disregard steps
related to extra spool assembly.