atwood 3:1 Gearbox Replacement - Manuel

SAFETY ALERT SYMBOLS
Safety Symbols alerting you to potential personal safety hazards. Obey all safety
messages following these symbols.
ƽ
WARNING
ƽ
CAUTION
avoid possible avoid possible
injury or death injury and/or property damage
FOR COMPLETE LANDING LEGS INSTRUCTIONS CONSULT MPD 71125.
For your safety read all instructions before operating landing legs.
NOTE : Atwood 5th Wheel Landing Legs are intended for use on
recreational vehicle 5th wheel-type trailers only.
LANDING LEG CAPACITY
Standard Duty - OBSOLETE
Manual ▼ 1,000 lbs. per leg, 2,000 lbs. system
Manual ▼▼ 2,000 lbs. per leg, 4,000 lbs. system
Electric ▵ 2,000 lbs. per leg, 4,000 lbs. system
Heavy-Duty
Manual ▼▼ 3,000 lbs. per leg, 6,000 lbs. system
Electric ▵ 2,500 lbs. per leg, 5,000 lbs. system
Electric ▵▵ 3,000 lbs. per leg, 6,000 lbs. system
Super-Duty
Electric ▵▵ 4,000 lbs. per leg, 8,000 lbs. system
▼ without gear box ▵ single motor
▼▼ with gear box ▵▵ dual motor
DO NOT EXCEED THIS CAPACITY
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WARNING
TRAILER CAN MOVE OR COLLAPSE
• Never exceed the rated capacity of 5th Wheel Landing Leg.
• LANDING LEGS ARE NOT DESIGNED TO BE USED AS TRAILER JACKS . Do not use
the landings legs to lift the trailer during tire changes, axle work or
trailer servicing (the trailer weight will exceed the capacity of the
landing legs). The landing legs are designed to stabilize a portion of
the trailer’s weight. Support the front end of the trailer with structural
stands rated for the GVWR of the trailer.
• The pin between the ram and drop tube should be the same diameter
as the adjustment hole in the drop tube. Otherwise premature wear
on drop tube and ram can occur.
DETERMINE LANDING LEG TYPE
STANDARD DUTY = Leg with a flat top ( FIG 1-A).
HEAVY DUTY = Leg with a rounded top ( FIG 1-A), with 1” between the
centers of the holes in the drop tube ( FIG 1-B).
SUPER DUTY = Leg with a rounded top, with 1-1/2” between the centers
of the holes in the drop tube.
THE DRIVE SHAFTS ARE DIFFERENT . Check your kit. If you have a Standard Duty
leg set, the new drive shaft should be silver colored. For Heavy or Super
Duty, the drive shaft is gold colored.
REMOVAL PROCEDURE
1. Rotate the drive shaft ( FIG 2-A) on the driver leg to fully retract the
landing leg. Remove the motor (if there is one). Remove the old metal
gear box (
FIG 2-B) from the drive shaft.
2. Pop the cap ( FIG 1-A) off the top of the leg.
3. Locate the vertical ( FIG 2-C) and horizontal ( FIG 2-D) bevel gears at the
top of the leg.
4. Using a hammer and punch, drive out the pin ( FIG 2-E) under the
vertical bevel gear that holds it to the drive shaft.
5. Pull out the old drive shaft ( FIG 2-A).
6. Cut or grind the mounting lug ( FIG 2-F) off of the driver leg. Be careful
not to burn through the housing if you use a welding torch. Grind the
remaining weld flat to provide a smooth surface on the landing leg
face. Paint bare metal with black paint.
INSTALLATION PROCEDURE
1. Slip the new D-drive shaft ( FIG 2-G) through hole on the stop tab face
of the leg housing. Then slip the D-shaft through the vertical bevel
gear (
FIG 2-C) and through the second hole in the leg housing.
2. Drive the new pin ( FIG 2-E) back under the vertical bevel gear,
attaching it to the drive shaft.
3. Reattach the cap ( FIG 1-A) to the top of the leg.
4. Slip the new composite 3:1 gear box ( FIG 2-H) over the D-shaft of the
driver leg.
5. Slip the collar ( FIG 2-I) over the D-shaft of the driver leg and fasten it
with the screw ( FIG 2-J). The extruded part of the collar goes into the
cross shaft (if there is one).
6. Assemble the cross shaft, if used, ( FIG 2-K), by placing undrilled end
of 3/4” square tube into open end of 1” square tube.
7. Re-attach landing leg to frame. Fully retract before attaching cross
shaft. Fasten drilled end of 3/4” square tube to end of shaft through
gear box with 1/4” x 1-1/8” long screw (
FIG 2-M) and lock nut ( FIG 2-
N). Bolt end of 1” square tube to shaft of driven leg with 1/4” x 1-1/8”
long screw and lock nut. To prevent rattle between tubes, tack weld
1” square tube to 3/4” square tube.
E A
C
M K
N
M
J
I
A
1 2
G F
D
B
Metal Composite
B
H
ENGLISH • Service Kit
Effective 12/04/07
LITERATURE NUMBER MPD 70300
3:1 GEAR BOX REPLACEMENT
METAL GEAR BOX REPLACED BY COMPOSITE GEAR BOX
5 TH WHEEL LANDING LEGS
9
INSTALLATION IS THE SAME FOR ALL CAPACITIES