Disassembly Procedure

Maintenance

Disassembly Procedure

Disassembly Procedure

Preparation and Breakdown

  1. 1.
    Lift the rotary head (Figure 1, item A) and mount the rotary power head to the work stand (item B).
    Figure 1

    CAUTION

    Environmental Contaminant

    Oil is an environmental contaminant and must be discarded correctly.

    1. Use an oil drip container and grease rags for potential overflow when motor adapters are removed.

    2. Comply with work area cleanliness and safety.

  2. 2.
    Put a container (Figure 2, item B) below the rotary power head housing (item A). Drain oil from housing. Correctly dispose the oil or recycle used oil.
    Figure 2
  3. 3.
    Remove the hydraulic motor covers (Figure 3, item A), motor adapters, and O-rings from the rotary head cover (item B).

    NOTE

    It is common for rotary heads that are sent for rebuilding to have the hydraulic motors and subsequent hosing removed and replaced with just motor covers before delivery to the rebuild shop.

    Figure 3
  4. 4.
    Remove spindle cover (Figure 4, item A), shims (item B), wear bushing (item C), and swivel 30-X packing from spindle cap (item D).
    Figure 4
  5. 5.
    Remove the spindle cap (Figure 5, item A) with the spindle nut holding tool (item B), input pinion tool, and ratchet as shown. Rotate the input pinion tool (item C) counterclockwise as viewed from the top of the housing.
    Figure 5
  6. 6.
    Remove the drip shield, O-ring, and locking ring (Figure 6, item A) from the spindle.
    Figure 6
  7. 7.
    Remove the swivel housing (Figure 7, item A) from the rotary head cover.
    Figure 7
  8. 8.
    Remove the O-ring and the two oil seals from the swivel housing (Figure 8).
    Figure 8
  9. 9.
    Remove the wear sleeve (Figure 9, item A) with a three-claw puller tool (item B).
    Figure 9
  10. 10.
    Remove the lock-tongued washer (Figure 10, item A).
    Figure 10
  11. 11.
    Use the lock nut adjustment tool (Figure 11, item A), input pinion tool, and ratchet to remove the upper bearing adjusting nut.
  12. 12.
    Rotate the input pinion tool (item C) with the ratchet (item B) clockwise as viewed from the top of the housing to remove the upper bearing adjusting nut.
    Figure 11
  13. 13.
    Before completely removing the upper bearing adjusting nut (Figure 12, item A), install a small floor jack or scissor jack below the spindle to lift and support it through Step 1, 2, and 3 in Remove the Output Gear from the Spindle. The upper spindle bearing cone and cup will be removed along with the cover shown in Steps 16 and 17.
    Figure 12
  14. 14.
    Remove the retainer bolts and release the vacuum manually by pulling up the pressure relief valve stem (Figure 13, item B) at the same time. Remove the intermediate bearing adjusters. Remove O-ring and shims. Remove the intermediate bearing holder (item A) and the O-ring.
    Figure 13

    CAUTION

    Risk of Injury

    Incorrect handling of heavy sectioned snap rings can cause serious injury.

    1. Use extreme caution when you work with heavy sectioned snap rings.

    2. Use the applicable reteaching type snap ring pliers and wear gloves and face shield protection in case of an accidental flying snap ring.

  15. 15.
    Remove snap rings from above the input pinion bearings (Figure 14).
    Figure 14
  16. 16.
    Remove all cover cap screws (Figure 15, item A). Install four jacking bolts (item C) in the threaded holes provided in the housing cover (item B) as shown. Slowly tighten the jacking bolts alternately to break the cover seal and partially lift the cover from the housing.
    Figure 15
  17. 17.
    Insert lifting eyes (Figure 16, item A), attach them to the hoist with chains, and remove the cover (item B). Remove the oil seal from the cover. Using the same jacking bolts placed in threaded holes provided in housing cover below the upper spindle bearing cup, slowly tighten the jacking bolts alternately to push the bearing cup from the cover.
    Figure 16

    CAUTION

    Component Damage

    Can cause damage to the rotary housing.

    1. Do not distort the cavity in the rotary housing when removing the assemblies.

    2. Gently tap with a rawhide hammer to loosen if necessary.

  18. 18.
    Using the hoist and lifting chains (Figure 17, item A) attached to input pinion assembly (item B), lightly tap the assembly with either a rawhide or rubber mallet (item C) to remove the input pinions with the attached bearings from the housing. Use a large stationary hydraulic press to push the bearing off of the pinions.
    Figure 17
  19. 19.
    Using the hoist and lifting chains attached to the intermediate gear (Figure 18, item A), lightly tap the gear shaft with either a rawhide or rubber mallet to remove the intermediate gear shafts with the attached bearings. Use a large stationary hydraulic press to push the gear off of the intermediate shafts.
    Figure 18

Remove the Output Gear from the Spindle

  1. 1.
    Remove the output gear collar (Figure 1, item A).
    Figure 1
  2. 2.
    Use the applicable tools and a bottle jack or porto-power with a 25-ton minimum capacity as shown to remove the output gear from the spindle.
  3. 3.
    Use lifting chains and hoist to remove the output gear (Figure 2, item B) from the spindle (item A) as shown. Remove key from the spindle.
  4. 4.
    Remove both lower intermediate bearing cups from the housing with a three-claw puller.
    Figure 2
  5. 5.
    Remove the floor or scissor jack used to support the spindle. Put a drip pan (Figure 3, item C) below the rotary head.

    WARNING

    Component damage

    Rotating the rotary head housing can cause damage to the components.

    1. Make sure that the pillow blocks are used with rotary head stand.

    2. Make sure that there is enough space when rotating the rotary head housing.

  6. 6.
    Rotate the rotary head housing (item A) 180° within the work stand (item B) to remove the spindle.
    Figure 3
  7. 7.
    Remove the lower spindle retainer (Figure 4, item A). Remove the O-ring and oil seals from the lower spindle retainer.
    Figure 4

Remove the Spindle

  1. 1.
    Connect the chain to the hoist, insert the chain hook-end down through the spindle (Figure 1, item A), and attach lock-ring to hook (Figure 2, item B).
    Figure 1
  2. 2.
    Remove the spindle (Figure 2, item A) with the lower spindle bearing cone and oil seal wear sleeve still attached.
    Figure 2
  3. 3.
    Use a large stationary hydraulic press to push spindle bearing cone off of the spindle.
  4. 4.
    Use a three-claw puller or quick spot heating from a torch to remove the oil seal wear sleeve from the spindle.

    NOTE

    If spot heating is used to remove the oil seal wear sleeve, it can not be used again and must be thrown away and replaced with a new one.

  5. 5.
    Remove the lubrication pump (Figure 3, item A), pump drive adapter, O-ring, strainer, and all miscellaneous plugs from the housing.
    Figure 3
  6. 6.
    Use the jacking bolts placed in the threaded holes provided within the housing above the lower spindle bearing cup. Slowly tighten the jacking bolts alternately to push the bearing cup from the housing (Figure 4, item A).
    Figure 4

    NOTE

    Older housings do not have these threaded holes provided. If the housing is still reusable, these jacking holes can be drilled and tapped before reassembly.

    NOTE

    For field installation, the Product Support Department can provide details for the location and size of the tapped holes from the latest revision of the housing machining drawing.