U.S. TSUBAKI POWER-LOCK ®
Mounting and Removal Mounting 1) Clean and lightly oil or grease the shaft and hub bore. (Do not use oil or grease containing molybdenum disulphide.) 2) Remove the locking bolts from the POWER-LOCK ® and clean and lightly oil, or grease the contact surfaces. Threads and seats of the locking bolts must also be sufficiently lubricated. 3) Slip the POWER-LOCK and hub onto the shaft, tighten the locking bolts by hand until a slight positive contact is felt, and set them at the predetermined position, just as you would tighten lug bolts on a car wheel. When it is difficult to slip on, loosen the bolts. (Do not strike with a hammer.) 4) Next, determine the relative positioning between the hub and shaft (on the circumference and shaft line), and tighten the four bolts positioned diagonally with 1/4 of the required tightening torque. Proceed to tighten the remaining bolts in the same manner. 5) Increase the tightening torque to half of M A and tighten the bolts in the same way as in Step 4. 6) Increase tightening torque to M A and tighten the bolts. 7) Check the tightening torque of the locking bolts in sequence. This completes the mounting procedure.
Take out the POWER-LOCK by pulling the bolts
Tightening Torque of Locking Bolts Insert bolts into jack screw holes
Locking Bolt Size
POWER-LOCK ®
❈ Tightening Torque
M A (ft./lbs.)
Model Number (inch)
M6 M8
PL ³⁄₄ ~ PL1 ¹⁄₂ PL1 ⁵⁄₈ ~ PL2 ⁹⁄₁₆ PL2 ⁵⁄₈ ~ PL3 ³⁄₄
12.3 (10.1) 29.7 (24.6) 60.1 (50.5) 105 (87.0)
M10 M12 M14 M16 M18
PL3 ¹⁵⁄₁₆ ~ PL6 PL6 ¹⁄₂ ~ PL8
167 257 351
PL8 ¹⁄₂ ~ PL10 ¹⁄₂ PL11 ~ PL11 ¹³⁄₁₆
Locking Bolt Size
POWER-LOCK ®
❈ Tightening Torque
M A (ft./lbs.)
Model Number (metric)
M6 M8
PL019X047 ~ PL040X065 PL042X075 ~ PL065X095 PL070X110 ~ PL095X135 PL100X145 ~ PL160X210 PL170X225 ~ PL200X260 PL220X285 ~ PL260X325 PL250X355 ~ PL300X375
12.3 (10.1) 29.7 (24.6) 60.1 (50.5) 105 (87.0)
M10 M12 M14 M16
167 257
M18 351 ❈ Figures above in parentheses indicate the tightening torque M A for stainless steel bolts, which can be supplied upon request.
Use a Torque Wrench to Tighten Locking Bolts
The POWER-LOCK ensures transmissible torque (Mt) and thrust (Pax) only when the locking bolts are tightened to the proper torque. For this reason, use a torque wrench to tighten the locking bolts and thus obtain maximum performance from the POWER-LOCK.
Removal
1) Make sure that no torque or thrust is being applied to the shaft and hub. When shaft and hub are heavy, take them off the shaft carefully. 2) After completing Step 1, loosen the locking bolts. (No definite sequence is required.) 3) If the POWER-LOCK is still locked even after loosening the bolts, insert bolts into the jack screw holes (see photo below) and screw them in until it unlocks.
Jack Screw Holes for Removal
D-31
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