Columbia ParCar Expediter EX21-24A, Руководство по обслуживанию

Страница: 34 / 94

Section 5 - Accelerator & Brake System
PERIODIC BRAKE INSPECTION
Intervals between brake service and inspection may vary
depending on driving habits, type of driving, road and climate
conditions, and vehicle load
Periodic brake inspection is required to prevent
potential accident or injury and vehicle damage.
Periodic inspection should always include the following:
1. With vehicle stationary, depress the brake pedal and
check for 1/4” pedal free travel before resistance is felt.
Maximum pedal free travel should not exceed 2”
measured from floor board to top of pedal. If pedal free
travel is excessive, see
Mechanical Brake Adjustments .
2. Inspect brake parts under vehicle for physical damage,
corrosion, or cable fraying. Inspect dust boot at brake
actuating lever located behind each rear wheel. If cracked
or split, replace dust boot.
3. Operate vehicle on level ground, applying brakes to
ensure that both rear brakes apply equally. Check that
excessive force is not required to apply brakes. Excessive
force
required to apply brakes could indicate
malfunctioning brake linkage or excessive wear to brake
shoes.
ANNUAL BRAKE INSPECTION
To perform this service, raise vehicle using floor jack
and safely support it with jack stands positioned under
main frame tubes. See Section 3 - Lifting Instructions.
1. Perform steps 1 & 2 under Mechanical Rear Drum Brake
Disassembly .
2. Inspect drum for excessive or uneven wear. Look for
cracks radiating from stud holes. Maximum drum inside
diamete
r is 6.635” (168.4 mm). If drum is worn beyond
service limit, or uneven wear is shown, drum must be
replaced. See
Brake Drum Service .
3. Inspect brake shoes for thickness, uneven wear or
physical damage. If brake shoe lining at any point is
measured to be le
ss than 1/16” (1.6 mm), brake shoes
must be replaced. See Mechanical Rear Drum Brake
Disassembly.
4. Inspect for oil or grease contamination. Replace brake
shoes that are contaminated. See
Mechanical Rear Drum
Brake Disassembly .
5. Inspect dust boot at brake actuating lever. If cracked or
split, replace dust boot.
6. Wash mud, brake shoe debris, and dirt from brake
assemblies and drum. Apply white lithium grease to
contact points between brake shoe and brake back plate.
Remove excess grease to prevent brake shoe
contamination.
Do not use compressed air to blow dust from brake
assembly. Brake dust contains potentially harmful
contaminants.
7. Perform steps 5-8 under Mechanical Rear Drum Brake
Reassembly .
MECHANICAL REAR DRUM BRAKE
DISASSEMBLY
NOTICE: Before removal of existing parts, note location
of colored springs and other parts for correct
reassembly.
Always use a brake spring tool to remove and install
springs.
Always lay out brake shoes and other parts in order
removed. Reinstall in same order.
Always replace brake shoes that have been contaminated
with oils or lubricants.
Always replace any springs that appear stretched or
deformed.
1. Engage the brake. Remove four lug nuts and remove rear
wheel/tire assembly. Repeat for other rear wheel.
2. See Figure 5-1. Remove and discard cotter pin and axle
nut. Release brake and remove, brake drum and wheel
hub.
Refer to Figure 5-2 for steps 3 - 7.
3. Using good, quality brake pliers, remove auto adjuster
spring.
4. To remove brake shoes, hold 1/4 turn fastener with a
brake spring tool, rotate 1/4 turn and remove fastener and
spring. Repeat for other 1/4 turn fastener.
5. Grasp two brake shoes at centers. Pull them outward and
fold away from backing plate. Lift one shoe at a time from
brake anchor. Remove springs and shoes from brake
backing plate.
6. Slide the automatic adjuster screw and automatic adjuster
nut from brake assembly. Clean these parts thoroughly.
7. Wash any mud, brake debris, and dirt from brake plate.