MEGA Corp. MHT175-CAT777-INSP-RSP-5 - Manual (Page 13)

MHT175-CAT777(G)-5
4 Feb 2014
SECTION 3
Special Inspections
3-2
When operating the MHT175 beyond the allowable
12 degree limit, the ball will contact the upper
retention plate and potentially damage several
components of the system. Repeated and hard
contacts will damage upper retaining plates, upper
brass bushings, mount bolts and in severe cases
cause structural damage to the gooseneck.
INSPECTION
1. Remove hitch ball skirt assembly.
2. Check for broken bolts on the upper retaining
plate. If mount bolts are missing, have been
sheared off or laying on the lower receiver, severe
contact has occurred.
3. Check upper retaining plates and hitch ball for
damage. Inspect retaining plates and hitch ball
for evidence of hard contacts as shown below.
4. If hard contact is confirmed, remove upper
retention plates and inspect the upper retention
plates, brass bushings and lower receiver as
follows:
a. Inspect upper retention plates for
mushrooming of flat mating ends. Lay the
retention plate on a flat surface and check for
warpage. If retention plate is mushroomed or
warped the retention plate set must be
replaced.
b. Check upper brass bushings for over
oscillation ball contact as shown below. If
contacted and deformed replace upper
bushing set.
Ball Contact
Retention
Plate Contact
Mushrooming
Joint