GM 19330450
Steering Gear

To service and repair the rack and pinion off the vehicle (Magnasteer), it is essential to loosen both cylinder line fittings on the cylinder end on rack and pinion assembly and the both cylinders line assembly on cylinder end of the rack and pinion assemblage. Allow line side cylinder assembly to hang from the rack and pinion gear assembly and pull off the O-ring seals from the valve end of line and discard. Check the below lines of the cylinder for cracks, dents, and damage to threads and replace compounds if required. Feed the threads around all the fittings carefully, with finger tightening them to prevent stripping and cross-threading. Put in new O-ring seals to the valve end of the cylinder lines. Drain and bleed power steering system hoses, reservoir, and cooler lines using power steering GM P/N 1050017 (or another equivalent that meets GM Specification number 9985010). Lastly, fix the cylinder line assemblies to the rack and pinion assembly, locking the valve end fittings at 16.9 Nm (12.6 ft. lbs.) and locking the cylinder end fitting at 27 Nm (20 ft. lbs.).

It is necessary to begin Rack And Pinion replacement by locking the steering column using the steering column anti-rotation pin (J42640). After vehicle support the technician must remove the tires and wheels and afterward remove the Rack And Pinion heatshield. Keep the wheels facing forward by locking the steering column at position lock to avoid damaging the coil assembly. Three steps follow to replace the Rack And Pinion: initial removal of the intermediate shaft lower pinch bolt coupling precedes intermediate shaft Rack And Pinion disconnection. With the universal steering linkage puller (J24319-B) disconnect the steering knuckles from the outer tie rods by removing their retaining nuts. Customers must remove both the Rack And Pinion pressure and return hoses (1 & 2) from the Rack And Pinion while disconnecting variable effort steering electrical connectors when present. The first step is to take off the left stabilizer shaft insulator and disconnect tie rod ends from the knuckles and remove the Rack And Pinion mounting bolts. When changing the Rack And Pinion extract it through the left wheel opening after moving the outer tie rods to the new Rack And Pinion. You should first guide the new Rack And Pinion through the left wheel opening before mounting it with bolts which require torquing to 95 nm (70 ft. Lbs.). Install the left stabilizer shaft insulator while tightening Rack And Pinion pressure and return hoses (1 & 2) to 30 nm (22 ft. Lbs.). The variable effort steering system requires an electrical connection before installing the outer tie rod to the steering knuckles by using retaining nuts which should be torqued to 70 nm (52 ft. Lbs.). Fasten the intermediate shaft to the Rack And Pinion and deploy the intermediate shaft lower pinch bolt until torque reaches 45 nm (33 ft. Lbs.). After reinstalling the tires and wheels and lowering the vehicle to normal height perform the following steps: remove the j42640 from the steering column then bleed the Rack And Pinion system while checking for leaks and adjusting front toe.

To replace the Rack And Pinion, fit the Steering Column lock pin (J42640) to the Steering Column. Lift the vehicle, then take out the front tires and wheels as well as the Rack And Pinion heat shield. Before you detach and prevent disassemble coil within the Steering Column or intermediate shaft it is essential making sure that wheels are straight ahead and the Steering Column is in the lock position. Next tighten the other nut located at the bottom of the intermediate shaft. Loose the intermediate shaft pinch bolt and disconnect the intermediate shaft on the Rack And Pinion. Unscrew the outer tie rods retaining nuts, then use the universal steering linkage puller (J24319-B) to pull out the outer tie rod from the steering knuckles. If necessary, pull the variable effort steering electrical connection from the Rack And Pinion and remove the Rack And Pinion pressure and return hoses (1, 4) and left stabilizer shaft insulator. Remove Rack And Pinion mounting bolts and remove the Rack And Pinion through left wheel opening but make sure you take out the outer tie rods if you replace your gear. For installation mount the new Rack And Pinion through the left wheel opening and tighten the bolts with 65 nm (48 ft. LBS). Aftermarket the left stabilizer shaft insulator, hook up the Rack And Pinion pressure and return hoses (1, 4) and tighten with 27 nm (20 ft. Lbs.). If available, hook up the variable effort steering, one electrical connector that go to the steering knuckles and secure the outer tie rod end and bolt it to the steering knuckles and safe using retaining nuts and tighten it to 75 nm (55 ft. Lbs.). Connect the intermediate shaft to the Rack And Pinion and install the lower pinch bolt. Tighten of the lower pinch bolt to 47 nm (35 ft. Lbs.). Reinstall the Rack And Pinion heat shield, tires, and wheels, lower the vehicle, remove the Steering Column lock pin (J42640). Lastly, bleed the Rack And Pinion system, as well as check for leaks and front toe adjustments.

Take off the tie rod end clamp from the rack and pinion boot.

Remove the power steering gear pressure and return hoses.

Extract the power steering gear through the left wheel opening and transfer the outer tie rods if replacing the power steering gear.