TM 9-4910-663-12
(b) Use oil as listed on figure 3-1. If not available, use an
equivalent SAE motor oil.
(2) Varidrive (Part No. 7458-2).
(a) Lubricate the varidrive in accordance with figure 3-1.
(b) Bearings of the varidrive must be flushed as follows:
Remove bearing drain plugs from bracket and bracket
1.
support.
NOTE
Tachometer generator housing (6, fig 3-1) must be
removed to gain access to the rear bearing drain
plug.
2. Apply lubricant to grease fitting of bracket and bracket
support with pressure gun until all old lubricant is forced out of the
drain.
3. Operate varidrive for five minutes and then install
bearing drain plugs.
(3) Varidrive (Part No. 7458-4).
(a) Lubricate the varidrive in accordance with figure 3-2.
(b) After the first week of operation:
1.
Disconnect main power from the test stand.
2. Remove the oil fill pipe plug located at the top center
of the varidrive gearcase.
3. Remove the oil drain pipe plug located at the bottom of
the oil sight gage, and drain the oil from the varidrive gearcase.
4. Install the oil drain pipe plug at the bottom of the
oil sight gage.
5. Remove the oil level plug located on the lower left side
of the varidrive gearcase.
6. Fill the varidrive gearcase through the oil fill plug
opening with the specified oil, until the oil begins to drip from
the oil level plug opening.
7. Install the oil level plug and the oil fill plug.
Wipe
away all oil drips.
(c) Twice
yearly, change the varidrive gearcase oil, using
the same procedure as in step (b) above.
3-2
Change 1