Penske Racing Shocks 7300 Series - Manual (Page 4)

Disassembly/Assembly Instructions
Disassembly Instructions
1. Depressurize the shock after backing the adjuster to full soft.
2. Clamp the body cap eyelet in the vise with the shaft pointing up. Place overflow ring on body.
3. Unscrew the shaft bearing assembly from the shock body and remove the shaft assembly.
4. Drain the oil, when needed (if it contains excessive air bubbles). Please dispose of properly.
5. Clamp the shaft eyelet in the vise with the piston pointing up.
6. Remove the 3/4" ring nut to access valving or to change the seals in the shaft bearing.
7. Inspect and replace the damaged o-rings and wiper if needed.
Assembly Instructions
1. For revalving, refer to page 16 for additional information.
2. Reassemble the shaft, be sure that the piston is properly positioned. With the shaft still in the vise, the
compression valve stack is on the bottom and the rebound on top. It is very important that the piston is
positioned with the (6) concave ports facing up on the rebound side and the (3) concave ports facing down
on the compression side, see the following page.
3. Torque the 3/4" ring nut to 25 ft•lbs (300 in•lbs).
4. If the jet was removed, torque to 120 in•lbs.
5. Pressurize the reservoir to reposition floating piston (approx. 50 lbs.). This step is very important.
6. Fill the shock body with oil* to the bottom of the threads. (1/2" from the top of the body)
*NOTE: Penske Suspension Fluid is recommended. Use of alternate fluids
may have an adverse effect on the damper's internal sealing components. (ie: o-rings)
7. Insert the shaft and piston assembly into the shock body and begin to work out the air bubbles trapped in
the piston, by using 1"-2" strokes. Move the shaft up and down a few times, making sure the two port holes
in the shaft always remain below the surface of the oil or air will be sucked back into the piston assembly.
Lightly tap the eyelet with a mallet a few times to assure all the air bubbles are gone.
Note: this step is very important, repeat as needed.
8. Pull the shaft up until the two port holes in the shaft remain just below the surface of the oil.
9. Top off with oil and slide the shaft bearing down to seat the o-ring into the shock body without moving
the shaft.
10. Depressurize the reservoir while asserting pressure to the shaft bearing and thread the shaft bearing into
the shock body and tighten. Do not overtighten.
11. Pressurize to recommended nitrogen pressure for the specific track.
7300 Series Specifications
5" Coilover Body with Head Valve (Sweep Adjuster) 15.84" 4" 9.98"
6" Coilover Body with Head Valve (Sweep Adjuster) 17.84" 5" 10.98"
7" Coilover Body with Head Valve (Sweep Adjuster) 19.84" 6" 11.98"
8" Coilover Body with Head Valve (Sweep Adjuster) 21.84" 7" 12.98"
9" Coilover Body with Head Valve (Sweep Adjuster) 23.84" 8" 13.98"
7" Smooth Body Non-Head Valve (Knob Adjuster) 21.34" 7" 11.98"
8" Smooth Body Non-Head Valve (Knob Adjuster) 23.34" 8" 12.98"
9" Smooth Body Non-Head Valve (Knob Adjuster) 25.34" 9" 13.98"
7" Smooth Body with Head Valve (Knob Adjuster) 20.34" 6" 11.98"
8" Smooth Body with Head Valve (Knob Adjuster) 22.34" 7" 12.98"
9" Smooth Body with Head Valve (Knob Adjuster) 24.34" 8" 13.98"
*Also available in Non-Adjustable
Type Ext. Length Stroke Body Length
Body
Length
T
Extended
Length
T
S
T
Stroke
S S