MDP Operation & Maintenance Manual | 19
INSPECT / TORQUE BOLTS
Inspect all bolts for damage. Check the torque of all bolts and replace any bolt that is damaged or has been re-torqued
more than once. Always use replacement bolts of the same size and class as the one removed. Unless otherwise
specied, use class 10.9 metric hex head cap screws, class 10.9 metric at head cap screws and class 12.9 metric
socket head cap screws. When installing new bolts, ensure that the bolt is clean and dry.
Never use an inferior class fastener. Fastener failure
can cause damage, injury or death.
Replace Rotation bolts after 1500 hrs / 2 years. You may
need to rotate MDP to access bolts.
BUILD UP & WEAR PLATES
As the jaws become worn from use, the worn areas will need to be built up to prolong the life of the attachment. Some
areas of the jaw have wear plates that protect commonly worn surfaces and reduces the need to build up and hard-
surface.
Wear safety equipment when welding. This includes
eye protection, hard hat, steel toe shoes, gloves,
hearing protection and respirator. Do all work in a well
ventilated area.
CHECKING AND REPLACING WEAR PLATES
Wear bars are welded into the jaw and must be replaced after they have worn down to 1/4 their original thickness.
Using the MDP parts manual, ensure you have ordered the proper wear plate kits.
Installing Wear Bars
1. Preheat the area around the wear bar to 250° to 300° F.
2. Remove the worn wear bar.
3. Fit the new wear bar into the receptacle.
4. Weld the wear bar into place.
General Fastener Torque
FIGURE 21
Torque
Size
Class 10.9 Class 12.9
M10
41 Ft. Lbs. (55 Nm) 49 Ft. Lbs. (67 Nm)
M12
71 Ft. Lbs. (96 Nm) 85 Ft. Lbs. (116 Nm)
M14
112 Ft. Lbs. (152 Nm) 136 Ft. Lbs. (185 Nm)
M16
173 Ft. Lbs. (235 Nm) 207 Ft. Lbs. (281 Nm)
M20
335 Ft. Lbs. (454 Nm) 403 Ft. Lbs. (547 Nm)
M24
579 Ft. Lbs. (785 Nm) 693 Ft. Lbs. (939 Nm)
M30
1164 Ft. Lbs. (1579 Nm) 1391 Ft. Lbs. (1887 Nm)
Turntable & Rotation Head Fastener Torque
FIGURE 22
Size
Class Torque
M20
10.9 435 Ft. Lbs. (590 Nm)
M24
10.9 752 Ft. Lbs. (1020 Nm)
M30
10.9 1511 Ft. Lbs. (2049 Nm)
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