Digga PDD-PD50, Service & Repair Manual

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PM-000100-D PDD - PD50 Service and Repair Manual - October 2017
UNIT REASSEMBLY
1. Start with output housing assembly. Turn case upside down and position on table. Bottom seal end should be facing upward and install bearing
cup with appropriate tooling.
2. Install bottom seal applying a smear of Loctite 243 thread locker to outside of seal and fit using appropriate tooling. Ensure seal is flush with the
housing. Wipe off excess Loctite. Grease inner face of seal with EP grease.
3. Invert outer housing to upright position and place over securely positioned output shaft with splines facing upward. Using the appropriate
tooling, assemble the output housing onto the output shaft.
4. Install bearing race to output housing with appropriate tooling. Install bearing ensuring correct installation technique. Only drive the bearing
home via the inner cone of bearing. Hitting outer roller cage will damage the bearing.
5. While holding output shaft with one hand, rotate case to be certain it turns freely and smoothly. The slight resistance felt, if any, is due to shaft
seal load (drag) on output shaft.
6. On PDD – PD5, install a new locking tab making sure tabs are facing upwards. Tab will also locate onto output shaft spline. Fit lock nut with
chamfer facing downward and tension.
PDD – PD5 nut tension – 125ft/lbs (approx) PD6 – PD12 nut tension – 180ft/lbs (approx) PD15 – PD22 nut tension – 1000ft/lbs
(approx) PD25 – PD50 nut tension – 1200ft/lbs (approx) Refer to
(“Bearing Preload Chart P.12” for correct lock nut tension.)
7. Drive locking tab into the keyway of the output shaft.
8. PD6 – PD50 will have key steel instead of locking tab. Insert key after tensioning locking nut.
9. Clean and ensure inner section of housing and bearings are free from foreign matter.
10. For PDD – PD22. Lightly grease a new o-ring and install it into o-ring groove in case. For PD25 and up, use gasket sealant sparingly on o-ring
and mating surfaces.
11. Fit gear set and sun gear to the output housing. Line up bolt holes and fit ring gear. Make sure the ring gear sits flat on the
housing. Top up gear oil level to top of gear set.
12. For PD6 – PD10, lightly grease o-ring and fit to interim housing and fit interim housing to gear set lining up scribe mark.
Steps with an asterisk (*) apply only to PD units with 2 separate planetary. (PD25 - PD50) and HF units (PD8HF – PD10HF).
13. *Fit o-ring to interim housing using sealant as previously described, then fit interim housing to ring gear lining up scribe mark.
NOTE: IF THE BEARINGS HAVE BEEN REPLACED, IT IS LIKELY THAT A NEW KEYWAY WILL HAVE TO BE CUT IN THE LOCKNUT.
NOTE: BE CERTAIN THAT THE O-RING STAYS SEATED IN GROOVE DURING STEP DURING ALL ASSEMBLY STAGES.