Woods Equipment MDO80-2 manual Dealer Service, Gearbox Maintenance

DEALER SERVICE

WARNING

On pull-type units, a pin is installed to prevent the height adjustment crank from detaching. Do not operate or service unit unless pin is installed.

Before performing any service or maintenance, lower equipment to ground or block securely, turn off engine, remove key, and disconnect driveline from tractor PTO.

Keep all persons away from operator control area while performing adjustments, service, or maintenance.

CAUTION

Always wear relatively tight and belted clothing to avoid getting caught in moving parts. Wear sturdy, rough-soled work shoes and protective equipment for eyes, hair, hands, hearing, and head; and respirator or filter mask where appropriate.

The information in this section is written for dealer ser- vice personnel. The repair described herein requires special skills and tools. If your shop is not properly equipped or your mechanics are not properly trained in this type of repair, you may be time and money ahead to replace complete assemblies.

GEARBOX MAINTENANCE

Before beginning any gearbox repair, please read this entire section. Many steps are dependent on each other.

Always make sure proper vent plug is installed in top of gearbox. Proper gear lube level for gearbox is half full. Never operate cutter unless gearbox is half full of SAE 90W gear lube.

Troubleshooting is an important part of gearbox main- tenance. Check for leakage and bad bearings.

Bearing Check

Bearing maladjustment or failure is indicated by exces- sive noise and noticeable side or end play in gear shafts.

Possible Leakage Causes

Leakage may be caused by an improperly operating vent plug. The plug has a check valve in it; remove and apply very low pressure air to the bottom to check for proper venting.

Check housing for visible signs of leakage.

Check for leaks at vertical and horizontal seals and gaskets.

Take necessary corrective action and clean area where leakage was evident. Place cutter in service and check to ensure leakage has stopped.

Leakage Repair

Permatex Aviation 3D Form-A-Gasket® or equivalent is the recommended sealant for gearbox repair.

Leakage at the horizontal seal or gasket can be cor- rected without removing gearbox from cutter.

Remove fill plug and siphon gear lube from gearbox. Remove and replace leaking seal or gasket. Refer to Seal Installation section, page 23.

Removing Gearbox from Cutter

Remove nut from belt tension idler adjustment rod.

Remove belt shields. Remove belts.

The front gear stand bolts are tack welded in place. Loosen the nuts to protect bolt threads and break tack welds by rapping them with a hammer. Remove nuts and bolts.

Remove nuts from the rear gear stand bolts. Tip rear of gear stand up over bolts and slide the stand rearward.

Cut the safety wire and remove bolt from drive pulley under gearbox.

Disassemble split taper bushing (located on bottom of drive pulley) by removing the three bolts and inserting two of them into the threaded holes. Tighten alternately to press bushing off.

Remove the four gearbox attaching bolts from the gear stand and remove gearbox from stand.

Gearbox Disassembly

(Refer to illustration on page 45.)

Remove the horizontal and vertical gear shaft housings from gearbox housing. Remove seals. Remove tack weld, holding sleeve to shaft, by grinding. Press gear and shaft from housing. Remove cups from housing.

Damage Inspection

Inspect gears for excessive wear. Some wear is nor- mal. Gears will show more wear on loaded side. They are forged and surfaces will appear rough, even when new. The wear pattern should be smooth.

Do not replace gears unless deep gouges, chips, deep pitting or deep wear grooves are present.

Inspect gear shafts and sleeves. Pay specific attention to areas where seals seat. Check for cracks, grooves,

22 Dealer Service 15916 (Rev. 5/11/2007)