Multiquip Trailers - Manual (Page 35)

trailer • owner's manual — rev. #4 (11/08/13) — page 35
Replacing Fasteners
Should any of the fasteners become damaged, lost or
corroded, it is important to replace them with fasteners of
the same size and strength grade (or better) as the originals.
Be sure that the fastener components (capscrew, washer
and nut) are all of the same strength grade.
suspension
Leaf Suspension
The leaf suspension springs and associated components
(Figure 16) should be visually inspected every 6,000 miles
for signs of road damage, excessive wear, elongation of
bolt holes, and loosening of fasteners. Replace all damaged
suspension parts immediately. Torqued suspension
components as detailed in Table 6.
Figure 16. Leaf Suspension Components
U-BOLT
LEAF
SUSPENSION
TIE PLATE
AXLE
U-BOLT
LOCKING
NUT
SHACKLE
BOLTS
FRONT
HANGER BOLT
FRONT
HANGER NUT
SHACKLE
NUTS
SHACKLE SUPPORT
BRACKET IS WELDED
TO FRAME
HANGER SUPPORT
BRACKET IS WELDED
TO FRAME
table 6. Fastener types and strength grades
item torQue (Ft.-lbs)
3/8"" U-bolt Min-30 Max-35
7/16"" U-bolt Min-45 Max-60
1/2"" U-bolt Min-45 Max-60
Equalizer Bolts
Snug fit only. Parts must rotate freely.
Locking nuts are provided to retain nut-
bolt assembly.
Shoulder Type
Shackle Bolt
maintenance
Torsion Suspension
With torsion systems, the suspension takes place inside
the square tube which is filled with highly resilient rubber.
The mounting bracket of the torsion assembly is bolted
directly to the trailer frame. (See Figure 17 below). Except
for periodic inspection of the bracket’s fasteners to the
vehicle frame, no other suspension maintenance is required
on the axles.
Figure 17. Torsion Suspension Components
warning
Worn or broken suspension parts can cause loss of
control and injury may result.
Have trailer professionally inspected annually and after
any impact.