
Operation
13
602378 REV AA
12/18/2018
SHEAR BOLT REPLACEMENT
Never replace shear bolt or auger retaining bolt
with a different length, or grade. Always use a
grade 2 bolt as a replacement.
Shear bolts are important for both safety and prevent
-
ing damage to the digger. Their intended function is to
break when too much force is applied.
Always replace shear bolts at the gearbox input with
manufacturer's part or one of the same size, length and
SAE
Grade 2
specification.
Hardened bolts or bolts that are too long can cause
accidents resulting in injury or death.
The set screw, Figure 3, prevents the driveline from
coming off gearbox shaft if the shear bolt should shear.
Figure 3
. Shear Bolt Replacement
PRE-OPERATION CHECKLIST
___ Review and follow all safety rules and safety
decal instructions on pages 5 through 9.
___ Check that all safety decals are installed and in
good condition. Replace if damaged.
___ Check that all shields and guards are properly
installed and in good condition. Replace if dam
-
aged.
___ Consult local utilities before digging. Know loca
-
tion of and avoid contacting all underground
cables, pipelines, overhead wires and other haz
-
ards in digging area.
___ Check that auger point and all cutting edges are
intact and in good repair.
___ Check that equipment is properly and securely
attached to tractor.
___ Make sure driveline spring-activated locking pin
slides freely and is seated firmly in tractor PTO
spline groove or gearbox PTO spline groove.
___ Set tractor PTO at correct rpm for your equip
-
ment.
___ Check all lubrication points and grease as
instructed in “Service, lubrication information.”
___ Lubricate all grease fitting locations. Make sure
telescoping PTO shafts and universal joints are
lubricated.
___ Check that all hydraulic hoses and fittings are in
good condition and not leaking before starting
tractor. Check that hoses are not twisted, bent
sharply, kinked, frayed or pulled tight. Replace
any damaged hoses immediately.
___ Make sure tractor 3-point lift links do not interfere
with hydraulic hoses or driveline throughout full
turning range.
___ Check that all hardware and cotter pins are prop
-
erly installed and secured.
___ Check attitude adjustment of auger.
___ Check and keep all bystanders 25 ft away from
equipment working area.
___ Before starting engine, operator must be in trac
-
tor seat with seat belt fastened. Place transmis
-
sion in neutral or park, engage brake and
disengage tractor PTO.
WARNING
1. Gearbox
2. Driveline
3. M6 x 25 set screw
4. M6 jam nut
5. 3/8 NC x 3 grade 2 shear bolt
6. 3/8 lock washer
7. 3/8 NC hex nut
*Input shield
removed for detail