SECTION 7—REAR FRAME
50
Removing/Installing the Rear Springs
NOTE: For this procedure, refer to FIGURE 7.2.
NOTE: Place two 5-inch blocks under the base frame to lift frame off the ground to ease in performing this procedure.
NOTE: If replacing a rear spring, it is strongly recommended to replace both rear springs to ensure proper operation of the wheelchair.
Removing
NOTE: Depending on the date of manufacture, the stability lock boot will be secured to the wheelchair frame by a tie-wrap or a 10-32
hex head screw.
1.
Remove the two stability lock boots.
2.
Place two 5-inch blocks under the base frame.
3.
Compress the rear springs:
•
Block Method - Lift the rear frame assembly up and add spacers under the rear casters until the rear springs remains
compressed and the nylon spacer can be removed.
•
Clamp Method - Perform the following steps:
i.
Remove the two nylon spacers and 1/4-20 X 5/8-inch mounting screws.
ii. Let the rear frame assembly fall away from the battery box to create more room to work.
iii. Remove the rubber end caps and use a vise-clamp or c-clamp to compress springs until the nylon stop can be
removed.
NOTE: If necessary, use a flat screwdriver to pry the nylon stop from the spring bracket.
4.
Remove the two 5/16-18 locknuts, 5/16 X 5/8 X 1/16-inch washers and nylon stops from the two spring brackets.
5.
Remove the blocks from under the rear casters or remove the vise clamp or c-clamp.
6.
Remove the two rear springs.
Installing
NOTE: If replacing the spring, perform this procedure with a new spring.
1.
Position the two rear springs between the spring brackets and the rear frame assembly.
2.
Perform one of the following to compress the rear springs:
•
Block Method - Lift the rear frame assembly up and
add spacers under the rear casters until the rear
springs remains compressed.
•
Clamp Method -
i.
Use a vise-clamp or c-clamp to compress
springs.
ii. Using the two 1/4-20 X 5/8-inch mounting
screws and nylon spacer, secure the rear frame
assembly to the wheelchair frame. Torque to 75
in-lbs ± 20%.
3.
Install the two 5/16-18 locknuts, 5/16 X 5/8 X 1/16-inch
washers and nylon stops onto the two spring brackets.
Torque to 75 in-lbs ± 20%.
4.
Remove the blocks from under the rear casters or
remove the vise clamp or c-clamp.
5.
Adjust the stability lock setting. Refer to Adjusting the
Stability Lock Setting on page 53.
NOTE: Depending on the date of manufacture, the stability lock
boot will be secured to the wheelchair frame by a tie-wrap or a
10-32 hex head screw.
6.
Install the two stability lock boots onto the base frame
guide block.
FIGURE 7.2
Removing/Installing the Rear Springs
Rear Frame
Assembly
Nylon Stop, 5/16-18 Locknut and
5/16 X 5/8 X 1/16-inch Washers
Spring Bracket
Rear
Spring
