2-4 Accumulator Piston Kit Forward Accumulator
CD4E
Instruction Data Sheet
PART NUMBERs 73840-24, 73840-FWD, 73840-LR
2-4 Accumulator Piston & Spring Kits 2-4 Accumulator Piston Kit
Low Reverse Accumulator Piston Kit 73840-LR
™
73840-24 • Piston • Spring • O-Rings (2) • Rivet (not shown)
White
Forward Accumulator Piston Kit 73840-FWD
Forward Accumulator Piston Kit Accumulator Valve Body
73840-FWD • Piston • Spring • Spring • O-Rings (2) • Rivet (not shown)
Red Blue
1. Remove & Check Piston for Wear Each piston should be removed from the bore to visually check for excessive wear and/or worn bore ridges. Often the OE pistons seize in the bore and cannot be pulled out or hydraulically pushed out due to out-of-round conditions. The most successful removal procedure for a stuck piston is to remove it from the opposite side (e.g., low/reverse is stuck, remove from forward piston bore).
Low Reverse Accumulator Piston Kit 73840-LR • Piston • Spring • Spring • Spring • O-Rings (2) • Rivet (not shown)
2-4 Accumulator Piston Kit 73840-24
Purple Pink Black
• To remove a seized forward or low/reverse piston, drill from the empty piston bore by drilling a 1/4" hole through the end of the wall (approximately on center, but not critical) • To remove a seized 2-4 accumulator piston, drill through the end wall. • Drive out the seized piston mechanically (with a 1/4" or smaller punch) or hydraulically, via the 1/4" hole. 2. Install Rivet Install the enclosed 1/4" large head aluminum rivet into the hole and peen over until flat and snug. Set a large diameter pin into a vise (1.00" to 1.20"). With rivet in place, put the valve body over the pin. Peen the rivet head until tight and flush. 3. Installation & Assembly a. If the bore is badly worn or has ridges, before installing the Sonnax piston and springs, buff the bore with fine emery cloth and then with Scotch-brite™ to remove any ridges. Discard the OE piston and springs. Remove any debris. b. Lubricate the bore. Place the two Viton® O-rings into the grooves on the piston and lubricate. Use the photographs on page 2 to ensure the proper replacement springs are installed and parts are properly oriented.
©2011 Sonnax Industries, Inc. TIME TESTED • INDUSTRY TRUSTED
800-843-2600
•
73840-24 Rev:-, 73840-FWD Rev:-, 73840-LR Rev:-, 73840-IN 07-26-11
802-463-9722
•
F:802-463-4059
•
www.sonnax.com
1
CD4E
Accumulator Piston & Spring Kits
PART NUMBERs 73840-24, 73840-FWD, 73840-lr
Instruction Data Sheet
Forward Accumulator
2-4 Accumulator Red Spring OE Retaining Clip
White Spring
Accumulator Piston
OE Retaining Clip
Accumulator Piston
OE Retaining Clip
Blue Spring
Low/Reverse Accumulator
Pink Spring
Black Spring Accumulator Piston
Purple Spring
Accumulator Valve Body 2-4
4. Final Testing A vacuum test at either port indicated fails to hold 18" of vacuum or higher, or if visual wear is detected at the inboard overlap valve bores.
2
©2011 Sonnax Industries, Inc. 800-843-2600
•
FC
20
15
10
25
5
0 30 VACUUM TEST
LRC
73840-24 Rev:-, 73840-FWD Rev:- 73840-LR Rev:- 73840-IN 07-26-11
802-463-9722
•
F:802-463-4059
•
www.sonnax.com
TIME TESTED • INDUSTRY TRUSTED
Instruction Data Sheet
PART NUMBERs 73840-24, 73840-FWD, 73840-LR
2-4 Accumulator Piston & Spring Kits 2-4 Accumulator Piston Kit
Low Reverse Accumulator Piston Kit 73840-LR
™
73840-24 • Piston • Spring • O-Rings (2) • Rivet (not shown)
White
Forward Accumulator Piston Kit 73840-FWD
Forward Accumulator Piston Kit Accumulator Valve Body
73840-FWD • Piston • Spring • Spring • O-Rings (2) • Rivet (not shown)
Red Blue
1. Remove & Check Piston for Wear Each piston should be removed from the bore to visually check for excessive wear and/or worn bore ridges. Often the OE pistons seize in the bore and cannot be pulled out or hydraulically pushed out due to out-of-round conditions. The most successful removal procedure for a stuck piston is to remove it from the opposite side (e.g., low/reverse is stuck, remove from forward piston bore).
Low Reverse Accumulator Piston Kit 73840-LR • Piston • Spring • Spring • Spring • O-Rings (2) • Rivet (not shown)
2-4 Accumulator Piston Kit 73840-24
Purple Pink Black
• To remove a seized forward or low/reverse piston, drill from the empty piston bore by drilling a 1/4" hole through the end of the wall (approximately on center, but not critical) • To remove a seized 2-4 accumulator piston, drill through the end wall. • Drive out the seized piston mechanically (with a 1/4" or smaller punch) or hydraulically, via the 1/4" hole. 2. Install Rivet Install the enclosed 1/4" large head aluminum rivet into the hole and peen over until flat and snug. Set a large diameter pin into a vise (1.00" to 1.20"). With rivet in place, put the valve body over the pin. Peen the rivet head until tight and flush. 3. Installation & Assembly a. If the bore is badly worn or has ridges, before installing the Sonnax piston and springs, buff the bore with fine emery cloth and then with Scotch-brite™ to remove any ridges. Discard the OE piston and springs. Remove any debris. b. Lubricate the bore. Place the two Viton® O-rings into the grooves on the piston and lubricate. Use the photographs on page 2 to ensure the proper replacement springs are installed and parts are properly oriented.
©2011 Sonnax Industries, Inc. TIME TESTED • INDUSTRY TRUSTED
800-843-2600
•
73840-24 Rev:-, 73840-FWD Rev:-, 73840-LR Rev:-, 73840-IN 07-26-11
802-463-9722
•
F:802-463-4059
•
www.sonnax.com
1
CD4E
Accumulator Piston & Spring Kits
PART NUMBERs 73840-24, 73840-FWD, 73840-lr
Instruction Data Sheet
Forward Accumulator
2-4 Accumulator Red Spring OE Retaining Clip
White Spring
Accumulator Piston
OE Retaining Clip
Accumulator Piston
OE Retaining Clip
Blue Spring
Low/Reverse Accumulator
Pink Spring
Black Spring Accumulator Piston
Purple Spring
Accumulator Valve Body 2-4
4. Final Testing A vacuum test at either port indicated fails to hold 18" of vacuum or higher, or if visual wear is detected at the inboard overlap valve bores.
2
©2011 Sonnax Industries, Inc. 800-843-2600
•
FC
20
15
10
25
5
0 30 VACUUM TEST
LRC
73840-24 Rev:-, 73840-FWD Rev:- 73840-LR Rev:- 73840-IN 07-26-11
802-463-9722
•
F:802-463-4059
•
www.sonnax.com
TIME TESTED • INDUSTRY TRUSTED
