Alamo HYDRO 15 - Manual (Page 118)

HYDRO 15 (Service Manual) 09/06
© 2006 Alamo Industrial
Section 7 - 8
Speed Increaser Service & Repair
Dis-Assembly Prodedure:
Important!
It is assumed that the pump has been disconnected from speed increaser, the speed increaser has been
disconnected from the tractor mount plate. If not see the step previously instructing the mounting of speed
increaser and pump. The speed increaser has been cleaned and drained of oil.
Dis-assemble & Re-assemble for Inspection Only!
1. There are different ways to dis-assemble the speed increaser, If the purpose is to only inspect the
components the housing halves can be unbolted (figure 4 item 31, 32 & 33) allowing the two halve to come
apart leaving the components in one housing half. This will allow the inspection of the gears and the
bearings. The gears can be lifted up out of the housing to allow the inspection of the other side bearings. If
every thing is OK the two halves cane be bolted back together. It is recommended that the gasket
(figure
4 item 18) be replaced. The end play on the bearings should not change and if they were correct before they
should be correct now.
2. Check the end play on the shafts (figure 4 item 2 & 5) it should be from .007 to .011 . If not the shims
will need to be added or removed to adjust the end play, this will be done on the PTO side closed top cover
(figure 4 item 7) and the PTO side open cover (figure 4 item 9). Add or remove shims to adjust shaft end
play as needed (figure 4 item 21, 22, 23 & 24 for open cover and items 25, 26, 277 28 for closed cover) .
3 Refill speed increaser with oil, Check the Oil level in the speed changer Use a recommended grade
of oil. A recommended grade is SAE 90W oil with E.P. Additive. Most speed increaser are installed where
the pump will mount above the PTO (figure 1) but in some case it may require the pump be mounted below
the PTO shaft height. If this is the case the breather plug will need to be installed in a different location on
one of the side plugs. Normal fill level is the setscrew plug about 1/3 of the way up on the side of the
housing. If Speed increaser is turned to the bottom opposite what is shown in figure 1 the level plug will be
the one that was on the bottom before and would be just below the center line of the bearings
(figure 3)
Dis-assemble for Replacement of Components!
1. Check to make certain the splined adapter (figure 2) has been removed so it does not fall out during
moving the speed increaser, if the new style without the snap ring is used make certain to get the tube
spacer that goes with the splined adapter. If the old style with snap ring the snap ring will stay on the
splined adapter.
2. Move the speed increaser to a wash area and clean the exterior of unit. Set speed increaser above a
drain pan, remove the lower drain plug, the upper vent breather and allow the speed increasers oil to drain
out into catch pan.
3. Lay the speed increaser on bench with the tractor PTO side down against the bench (figure 3). Remove
Pump flange (figure 4 item 6) by removing the 6 bolts and lockwashers (figure 4 item 29 & 30) . Remove the
pump flange by pulling straight up and away from speed increaser, if need be use a screw driver to pry
pump flange up being careful not to scratch the machined surfaces. After remove inspect the pump flange
and remove the seal (figure 4 item 10) from pump flange. There will be fibre gasket
(figure 4 item 24) be-
tween pump flange and speed increaser housing half (figure 4 item 16), check to see if it stayed with pump
flange or housing half.
4. Remove open cover (figure 4 item 9) on the pump flange side by removing the 6 bolts & lockwashers
(figure 4 item 29 & 30) . Pull the open cover up away from speed increaser. The open cover will have a seal
(figure 4 item 10) in it, remove the seal. Inspect the cover and the seal OD for damage that may have been
caused by cover being damaged. There is a gasket that should be on this cover (figure 4 item 24) check to
see if on cover or housing half. There is a spacer ring (figure 4 item 35) under cover and against bearing cup.