ENGLISHFRANÇAISEESPAÑOL
5. BELT PULLEY INSTALLATION ONTO KEYWAY-TYPE CRANKSHAFT
When installing the belt pulley and/or clutch onto keyway-type
crankshaft (PTO shaft), proper and correct arrangements are needed.
The following illustration shows the correct installation of the applicable
component parts.
Pulley
Bolt
Washer
PTO shaft
Key
■
SAE (inch) keyway-type crankshaft
Washer; Use the washer (material; SS41P) with the thickness
described below;
SX17/21 SX30
Washer
Thickness
in. (mm)
0.177 (4.5)
or over
0.248 (6.3)
or over
ROBIN genuine part
Thickness;
in. (mm)
OD;
in. (mm)
ID;
in. (mm)
Material;
020-00801-40,
Washer
0.177 (4.5)
1.100 (28)
0.335 (8.5)
SS41P
(NA)
Bolt; Select the proper bolt and tighten it to the specied
tightening torque, as mentioned below;
SX17/21 SX30
Thread dimensions 5/16 – 24UNF2B 7/16 – 20UNF2B
Effective
thread length
in. (mm)
0.63 to 0.87
(16 to 22)
0.71 to 1.06
(18 to 27)
Strength “8T” or higher
Tightening Torque
ft•lb.(N•m)(kgf•cm)
14.8 - 16.2
(20 - 22)
(204 - 224)
36.9 - 44.3
(50 - 60)
(510 - 612)
(No ROBIN genuine part is available.)
Key Location
When using the belt pulley with the extended boss on both
side as shown in the illustration, put the spacer so that the
key stays in the keyway portion of the crankshaft.
Proper
Improper
Spacer
Key
Key should be within this portion.
Key
Belt Pulley Installation
Install the belt pulley in the no over-hang condition as shown
in the illustration.
Correct
Pulley
Incorrect
Crankshaft (PTO)
Pulley
Crankshaft (PTO)
Large over-hang
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