Install lift-assist casters – Great Plains NP30A 30-foot Predelivery Manual User Manual
Page 20
16
NP30 or NP40
Great Plains Manufacturing, Inc.
407-313Q
08/30/2011
Install Lift-Assist Casters
If the rear lift-assist casters are already installed, con-
tinue at “Install Center Gauge Wheels” on page 17.
If the implement is a 3-Point continue at “Install Trans-
port Rest” on page 18.
For this component, two lifters, or a single lifter and a set
of tall supports are required. Plan the installation based
on the available tools. These instructions assume a sin-
gle lifter and supports. The caster yoke
can be lifted
by strapping a lifter fork under the yoke.
51. Disconnect the rod ends of both lift-assist cylinders.
Refer to Figure 20
52. Loosen caster stabilizer jam nuts
. Back the
adjuster bolts
most of the way out. Secure with
jam nut finger-tight.
53. Locate two sets of the caster stabilizer internal com-
ponents:
266-012D PLATE RND 3/16" THK 1 7/8" DIA
807-143C SPRING COMP 1.88OD x .362W
266-020D UHMW RND 2.0 DIA X 2.0 LONG
54. Hoist one of the caster weldments
high enough
that the caster yoke assembly
407-317L CASTER LOCKUP ASSEMBLY
can be positioned under it.
Install supports at parallel arms or secure the hoist.
55. On one of the caster yokes, remove and save two
sets of:
802-034C HHCS 1/2-13X1 1/4 GR5
804-015C WASHER LOCK SPRING 1/2 PLT
and one:
161-231D NTA CASTER RETAINER CAP
Do not remove the:
804-102C PIVOT THRUST WASHER
56. Lift the yoke
. Align the vertical shaft
with the
pivot. Raise yoke one or two inches into pivot.
57. Insert into the stabilizer tube, in this order, one
each:
266-012D PLATE RND 3/16" THK 1 7/8" DIA
807-143C SPRING COMP 1.88OD x .362W
266-020D UHMW RND 2.0 DIA X 2.0 LONG
58. Fully raise the yoke into the caster weldment.
Secure with one cap
, and two sets of lock
washers
and bolts
.
59. Loosen the stabilizer jam nut
. Turn the adjuster
bolt
until it contacts the plate
and spring
.
Tighten one more inch. Secure jam nut.
60. Repeat step 54 through step 59 for the other caster.
61. Re-connect the lift-assist cylinders.
Figure 19
Caster Yokes on Trailer
31703
22
58
51
15
77
16
20
22
Figure 20
Lift-Assist Caster
31701
22
15
77
16
47
62
13
66
20
51
58
29
47
62
13
66
22
29
15
77
16
13
62
47
58
51
15
77