13
www. mechmaxx.com
7-5/8" (200 mm)
15-20hp 1.26" (31.9 mm)
1.25" (31.7 mm)
1.24" (31.4 mm)
1.22" (31.1 mm)
1.20" (30.5 mm)
25hp
30hp
35hp
45hp
Clutch Flange Dia PTO hp Spring Height
The stump grinder is shipped with a slip clutch PTO shaft.
Follow the steps below before usingyour stump grinder to
ensure the PTO shaft clutch plates are set properly.
**This procedure should be performed periodically during
ownership as the clutch plates can stick together, partic-
ularly after long periods of inactivity. This can prevent the
plates from slipping during operation as designed, result-
ing in high loads and possible damage to the steel shaft,
which is not covered under warranty.**
ƒ Connect the PTO shaft to the stump grinder and tractor
with the clutch end of the PTO shaft mounted to the
stump grinder. Insert the locking pin on the clutch yoke
and tighten the nut using a wrench/socket.
ƒ Using a coloured pencil or marker, scribe a line across
the exposed edges of the clutch plates.
ƒ Using a wrench/socket, loosen all 8 spring tension
nuts uniformly until the ends of the nuts are flush with
the ends of the bolts .
ƒ Start the tractor and engage the PTO for 2-3 seconds
to permit slippage of clutch surfaces. Disengage the
PTO then re-engage a second time for 2-3 seconds.
Disengage the PTO again, shut off the tractor, and
remove the key. Wait for all components to stop rotat-
ing before removing the PTO shaft from tractor.
ƒ Inspect the clutch and ensure that the scribed mark-
ings made across the clutch plates have changed
position. Slippage has not occurred if the two marks on
the clutch plates are still aligned. A clutch that has not
slipped must be disassembled to separate the clutch
plates.
ƒ Tighten all 8 nuts until the proper spring height dimen-
sion values are achieved per the "PTo Shaft Clutch
Spring Height vs. Horsepower" table for your PTO
output horsepower. It is recommended that a calliper
(either digital, dial, or vernier-similar to the one shown
below) be used to accurately verify the spring height
measurements. After setting all 8 spring heights, the
clutch is now ready for use.
ƒ The clutch should be checked during the first hour of
use and periodically each week thereafter. Excessive
clutch plate slippage, burning odour, or visible smoking
should not be observed during use.
PTO SHAFT CLUTCH RUN-IN
PTO SHAFT CLUTCH RUN-IN
Entanglement in a rotating driveshaft can
cause serious injury or death.Disconnect
and lockout power source before adjusting
or servicing.
Spring Tension Nut
PTO Shaft Clutch Spring Height vs. Horsepower
All ratings are at 540 rpm PTO speed
Typical vernier calliper
Spring Height
Nuts flush with bolt ends
0
1234 5678 9 10 11 12 13 14 15 16 17
cm
0
0 4
1/128
0 1
2
3
4
5
678
09
1/20
1
2
3
4
5
6
8
inch
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