5500 series Quarter Midget shocks Piston assembly instructions for Q.M.S. valving

psithurismaccountantUrban and Civil

Nov 29, 2013 (3 years and 11 months ago)

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5500 series Quarter Midget shocks


Piston assembly instructions for Q.M.S. valving



Disassembly of Shaft / Piston


Tip: Keep components in the order that you disassembled the shock to make
assembly easier.

1.

Insert shock eye into vice, piston pointing
up.

2.

Unscrew and remove stainless steel check valve assembly from shaft on top of
the piston. (If you are changing the low speed compression of the shock, you can
just change the compression bleed plate in the check valve without removing the
check valve, a
nd then reassemble the shock).

3.

Remove piston, shims, stop washer and closure nut from shaft assembly.

4.

Roll shaft on a flat surface to ensure that the shaft is straight.



Reassembly of Shaft / Piston


1.

Screw jam nut onto shaft.

2.

Tighten shaft into shock eye.

3.

Place movement indicator and closure nut (numbers down) on shaft.

4.

Place stop washer on shaft, flat side up.

5.

Place the spacer shim, B shim, A shim and pre
-
load shim(s) on the shaft in that
order.

6.

Place the piston on the shaft, with the small holes on the

piston facing towards
the shock eye (down).

7.

Place the pre
-
load shim(s), A shim, B shim, and spacer shims on the shaft.

8.

Tighten the stainless steel check valve assembly to 100 inch pounds.


(If you are updating your shocks from L.S.C. to Q.M.S. Valving y
ou will
change check valve assembly, and may need to change piston. The spring
in the end of shock shaft must be removed.)


















5500 series Quarter Midget shocks


Rebuild instructions for Q.M.S. valving



Disassemble 5500 Series Quarter Midget

Shock


Tip: Keep components in the order that you disassembled the shock to make
assembly easier.

1.

Insert shock body into vise, shaft pointing up. Remove bleed screw from closure
nut.

2.

Unscrew closure nut with spanner and slide closure nut up shaft.

3.

Grasp the shaft underneath the shock eye. Wiggle/rotate the shaft slightly as
you remove the shaft / piston assembly from the body. Remove the glide ring
from the piston when you pull the piston out of the body.



Reassemble 5500 Quarter Midget Shock


1.

Insert shock body into vise and fill shock body with oil ¾ of the way full.

2.

Coat piston glide ring with shock oil and install it on piston, holding it closed with
your thumb and forefinger. Reinsert piston / shaft assembly into body. Wiggle /
rotate the sh
aft slightly until the piston glide ring clears the cylinder. Depress the
piston into the cylinder until it is completely covered with oil.

3.

Slide bleed and refill cup over the end of the shock body and fill cup
approximately ½ up with shock oil.

Note: Air

bubbles might come from the space between the bleed/refill cup and the
shock body.

4.

Grasp the shaft by the shock eye, and cycle the piston through compression /
rebound. Do several times to remove air from piston.
Do not
pull the piston
completely out of t
he body or uncover the oil feed hole above the piston. Repeat
this procedure until all air bubbles are removed from the shock. Pull the piston
back up just below the closure nut threads.

Tip: After a few cycles, let it sit in the oil to let the air bubbles

work their way to the
surface.

5.

Hold the shaft assembly stationary at the top of the shock body. With bleed
screw removed from the closure nut, slide the closure nut assembly down the
shaft and screw it into the shock body until it starts to get tight. The
n back the
closure nut off 2 turns.

6.

Cycle shaft up and down with only fluid moving in and out of the bleed hole until
there are no air bubbles, pull the shaft assembly up until it is stopped by the
bottom side of the closure nut, and install the bleed scr
ew with a Phillip
screwdriver.

7.

Remove the bleed cup and tighten the closure nut after the bleed screw has
been installed. Assembly is now complete.



ADVANCED

RACING

SUSPENSIONS

1

5500

SERIES

QUARTER

MIDGET



31


2





3








4

5

28




6


27


7


8

9

10

10

11

THE

COMPRESSION
SIDE

OF

12

THE

PISTON

WILL

HAVE

1

TO

4

13

BLEEDING
HOLES.

THIS
EXAMPLE
HAS

ONE

HOLE

14


15

REBOUND
SIDE

HAS

MORE

OFFSET
THAN

THE

COMPRESSION
SIDE

16

13

12

11

10

19

20

17

18

23

21

19

18

22

23

POPPET
FACE

SEALS
AGAINST
HOUSING


SMOOTH 'LAPPED'
SIDE

GOES

AGAINST
POPPET FACE


REBOUND
SIDE

HAS

.020"

TO

.096"
BLEED

DRILLED
INTERNALLY


COMPRESSION
SIDE

HAS
O
-
RING
GROOVE



24

NOTE:

-

#11

AND

#12

ARE

"A"

AND

"B"

SHIMS.

REFER

TO

VALVING
CODE

FOR

THEIR

QUANTITY

-

#13

REPRESENTS
THE

NECESSARY SPACING
SHIMS

TO

GET

THE

DESIRED
SHIM

STACK

26

PRELOAD

OR

OFFSET

AS

SHOWN

ON

THE

VALVING

CODE


29

25

30

AIR

VALVE

OPTIONAL