Pump Assembly and Main Control Valve Body Assembly

Special Tools:

DISASSEMBLY AND ASSEMBLY





1. Remove bolts retaining pump assembly to main control valve body and separate valve body from pump assembly.

MAIN CONTROL VALVE BODY

Disassembly

Valve Body Separator Plate:

1. Place main control valve body on bench with valve body separator plate up, and remove two Torx (R) bolts retaining valve body separator plate to main control valve body.
2. Remove and discard separator plate with bonded gasket.





3. Remove six check balls, two relief valves and two filters. Clean filters.

4. CAUTION: Most valves are aluminum and cannot be removed using a magnet. Remove valves by tapping valve body on palm of hand to slide valves out of bores. It may be necessary to remove valves and springs using a pick. If it is necessary to use a pick, use extreme caution to prevent damaging valves or valve bores.

The individual valves and springs are removed by removing retaining clips and bore plugs. Clean valves, springs and main control valve body.

Inspect main regulator boost valve and sleeve for wear. Replace valve and sleeve if worn.

AX4S Main Control Valve Body Assembly - 1 Of 2:

AX4S Main Control Valve Body Assembly - 2 Of 2:

Assembly
1. Assemble valves and springs into main control valve body.





2. Install check balls, relief valves and filters.
3. Replace valve body separator plate with bonded gasket on main control valve body.

Valve Body Guide Pins:

4. Install Valve Body Guide Pin 307-S165 (T86P-70100-A) as shown. Install two Torx (R) bolts in main control valve body and tighten to 9-12 Nm (80-106 inch lbs.). Remove alignment pins.

PUMP ASSEMBLY

Disassembly





1. Remove two Torx(R) bolts retaining valve body separator plate to pump assembly housing. Remove valve body separator plate and discard separator plate with bonded gasket.





2. Remove three check balls and one relief valve.

Pump Cover Removal:

3. Remove bolts retaining pump cover to pump housing and remove cover.





4. WARNING: USE EXTREME CAUTION WHEN REMOVING SPRING TO PREVENT PERSONAL INJURY.

CAUTION: Place a piece of cardboard or suitable material under screwdriver to prevent damage to housing gasket surface.

Remove bore spring by prying spring out of housing.

Vane Support Retaining Pin:

5. Remove outside vane support retaining pin.

O-ring Service:

6. Remove metal O-ring retainer and O-ring from bore ring. Discard O-ring.





7. Remove and discard pump bore ring side seal.
8. Remove side seal support.





9. Remove top pump vane support ring.





10. Remove bore ring.





11. Remove seven vanes from rotor.





12. Remove pump rotor.





13. Remove bottom pump vane support ring.





14. Remove solenoids:
a. Remove one bolt from EPC solenoid retaining ring, remove EPC solenoid retaining ring and EPC solenoid.
b. Remove one bolt and TCC solenoid.
c. Remove three shift solenoids by depressing tabs, twisting counterclockwise and lifting up.

Assembly

Connector Placement:

1. Install solenoids and tighten to 9-12 Nm (80-106 inch lbs.). The shift solenoids will snap into place when the retaining tab is engaged.





2. Install bottom pump vane support ring.





3. Install pump rotor with small inside diameter counter bore facing up.





4. NOTE: Shiny portion of vane blade is installed toward outer vane support.

Install seven vanes in pump rotor.





5. Install bore ring.





6. Install top pump vane support ring.





7. Install new side seal support.
8. Install new pump bore ring side seal.

Vane Support Retaining Pin:

9. Install outer vane support retaining pin.





10. Install bore spring between case and tab on outer vane support.

O-ring Service:

11. Install new rubber O-ring in groove in outer vane support. Then, install metal O-ring retainer.

Pump Gear Alignment:

12. NOTE: Use the pump assembly shaft to align the pump gears while installing the pump cover.

NOTE: Make sure that pivot pin is flush with or below the surface of the main control valve body side of the pump assembly.

Install pump cover on pump housing and install retaining bolts. Tighten bolts evenly to 9-12 Nm (80-106 inch lbs.).





13. Install three check balls and one relief valve.

Valve Body Guide Pins And Bolts:

14. Position valve body separator plate with bonded gasket on pump housing. Insert Valve Body Guide Pin Set 307-S165 (T86P-70100-A) and Valve Body Guide Pin 307-166 (T86P-70100-B). Then, install two Torx (R) bolts. Tighten bolts to 9-12 Nm (80-106 inch lbs.). Remove guide pins.
15. Position main control valve body on pump.

Valve Body Guide Pins:

16. Insert Pump Body Guide Pins 307-169 (T86P-70370-A) and Valve Body Guide Pin 307-167 (T86P-70100-C), as shown. Install two valve body-to-pump retaining bolts and tighten to 9-12 Nm (80-106 inch lbs.). Remove guide pins.