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12
Maintenance
MECHANICAL COMPONENTS
Prior to the operation of a new snowplow, or one
which has been stored, inspect all hardware
and verify proper torque on all bolts and nuts
in accordance with the recommended torque
specifications.
GRADE 5 TYPE B & F LOCK NUT
TORQUE VALUES
Size
Ft-lbs.
5/16"
3/8"
1/2"
5/8"
117-165
GRADE 5 BOLT TORQUE VALUES*
Size
Ft-lbs.
1/4"
3/8"
1/2"
73-103
5/8"
146-206
*applications without lock nuts.
Loose bolts can cause hole elongation and
part failure resulting in dangerous operating
conditions and equipment breakdown.
Check all hardware periodically during operation
and keep tightened to specified torque value.
Replace worn bolts and lock nuts with grade 5
bolts and equivalent type B or type F lock nuts.
Type B lock nuts are plain hex; type F lock nuts
are flanged hex.
Inspect wear of the cutting edge before every
plowing season and frequently throughout the
season. Replace the cutting edge before wear
reaches the main plow blade.
Once a year before using the plow, check that
the moldboard will trip freely about the pivot
tube. With the snowplow mounted on the truck
and the cutting edge on the ground, unfasten the
extension springs on the back of the moldboard
by loosening the 5/8" lock nuts on the threaded
spring studs, then pull the top of the moldboard
fully forward.
N-m
13-18
17-25
23-33
31-44
58-82
79-112
158-223
N-m
8-12
11-16
29-41
39-56
99-140
198-279
If the blade does not trip freely, oil the pivot tube
at the four locations where it passes through
ribs on the back of the moldboard.
Damage to the snowplow or the truck may result
if the moldboard hits an obstruction during use
and doesn't trip.
Reassemble the two trip springs between lugs
on the pivot tube and channels along the upper
edge of the blade. Tighten the two lock nuts
until spring coils begin to separate.
The 5/16" hex bolts in the latch sliders are factory
retained with anaerobic threadlock. If removal
or replacement of these bolts is necessary,
purchase new bolts with threadlocker from your
Hiniker dealer, or apply a commercially available
threadlock, i.e., Loctite 242 (blue) or Perma-Lok
HM118 (red), to standard 5/16-18 X 3/4" grade
5 hex bolts before reassembly.
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