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Introduction
  • Designed to install and remove tapered bore bearings with minimal effort.
  • Allow better control of the bearing internal clearance reduction without damaging the bearing or other components.
  • Substantially reduces downtime during installation or removal of tapered bore bearings.

Description
  • Consist of a female threaded ring and a male ring with two O-ring seals.
  • All hydraulic nuts are supplied with:
    • Quick connection fittings (male G 1/4 in. and female 3/8 in. N.P.T.).
    • Two pipe plugs G 1/4 in.
    • One set of spare O-rings.

  • HMV-10 through HMV-40 have a Metric ISO fine thread profile.
  • HMV-41 through HMV-236 have a Metric ISO trapezoidal thread.
Unit of Measure

Specifications

Threads B

 N/A Tr1180x8

C

 N/A 1420 mm

D

 N/A 115 mm

E

 N/A 1379 mm

E1

 N/A 1183 mm

A

 N/A 22 mm

Piston Length of Travel

 N/A 40 mm

Piston Area

 N/A 1892 cm²

Manufacturing Part Number

 N/A HMV-236

Instructions

N/A Mounting

  • Inspect hydraulic system hoses, pipes, and pipe connections visually for leaks and make sure the joints are leakproof.
  • The maximum pressure permissible in the HMV series hydraulic nut is as follows.
    - HMV 10 - 60: 80 MPa (11600 psi)
    - HMV 62 - 100: 50 MPa (7250 psi)
    - HMV 102 - 236: 30 MPa (4350 psi)
  • The recommended oil viscosity is 1400 SUS (300cSt) at operating temperature (SAE 90 oil).
  • Initially, the piston must be in the innermost position.
    For this operation, please ensure the valve of the hydraulic hose is disconnected from the nut so the nut is not under pressure.
  • Threads are to be lubricated before mounting the nut onto the shaft or the sleeve.
  • Position the hydraulic nut concentric to the shaft or tapered sleeve. This can be done manually for smaller sizes, but if the nut is of larger size, supporting tool and fixtures to be used to avoid cross threading on shaft or taper sleeve.
  • Screw the hydraulic nut on the thread of the tapered sleeve or shaft until the piston makes initial contact with the surface of the bearing’s inner ring.
  • One of the two threaded holes must be plugged with the G ¼” ball plug before the hydraulic nut is pressurized. Keep the plug loose to purge air in next step.
  • Connect the hydraulic pressure system to the male connector and pump the oil out through the hydraulic lines to purge out the air from the hydraulic system before putting the nut under pressure. When you see oil coming from the ball valve, stop the pump and tighten the ball plug.
  • Power the nut until the piston meets bearing inner ring and place the dial gauge and set to zero.
  • Gradually increase the pressure and watch for the required axial displacement of piston and suggested RIC is attained in the bearing.
  • To avoid overextension of the piston, it’s stroke should only be permitted to the overextension piston groove on the OD of the piston. If the overextension piston groove travels past the face of the female threaded ring, the hydraulic nut can be damaged.
  • After mounting has completed, depressurize the pump to unload the nut.
  • Piston to be retracted into the nut. This can be done by further threading the nut up the shaft of bearing sleeve once after the pump has been depressurized.

Dismounting
  • For dismounting, thread the hydraulic nut onto the withdrawal sleeve thread until the piston meets the bearing’s inner ring.
  • For threaded sleeve, thread the hydraulic nut onto the shaft and the piston should meet the sleeve end. A stop ring is used to stop the bearing and to let the sleeve slide in against the taper.
  • All mountings to be made and visual inspections to be done as described in mounting instructions.
  • Pressurize the nut, the sleeve will be withdrawn from the bearing or the bearing will be pushed off the taper sleeve.
  • Pump to be depressurized and the piston to be retracted into the nut.

Ordering of the Spare Components
  • To order spare components for the hydraulic nuts, contact your local Timken sales representative.
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