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Tricks to Fill Your Transmission - No muss No fuss

 Or, How to get your tranny fluid to "Full" but not "Overfull"

-K Kloeber 06.06.2019
Rev 05.11.2021

 

 

HURTH CAUTIONS



REFILLING AFTER a FLUID CHANGE

Squeeze-Bottle Method

To fill the tranny I use a "Nalgene" plastic bottle with a pointy top, marked at 0.3 Liter (the fluid volume for the HB50 tranny) with vinyl tubing zip-tied onto the spout.  Fill to the full mark, stick the tube into the tranny, tip up the bottle, and let 'er rip.   

No funnels, so spills, no muss, no fuss, no runs, no drips, no errors.

 

This is the type filler bottle - a Nalgene lab dropper-bottle:




Or not quite as friendly, use a wash-down type bottle and squeeze it standing upright

(or cut the tube off right below the cap):



 

When I used to be on the hard during winter, I'd change the fluid in Fall and refill to the top (overkill to prevent moisture from accumulating in the case?)

 

In spring I'd use this trick to get the fluid down to the correct level:   

I have the tube of a battery filler marked with a tight zip-tie at the point equal to the tranny fluid being "full"

(i.e. below - the distance from the zip-tie to the bottom of the filler = the distance to the FULL mark on the tranny dipstick):

 

Hint: Tranny fluid will make the rubber bulb slippery, so put a very tight zip-tie around the bulb to hold the two parts together or Gorilla Glue them.

 

In Spring I'd insert the battery filler with the zip-tie at the top of the tranny, then squeeze and suck the fluid down to the bottom of the filler tube. This automatically brings the tranny fluid to the correct level (full mark on the dipstick.)

The same method can be used to add fluid between changes (or if overfilled when changing) -- overfill just a titch and suck it down to the full level (instead of using the add-a-little, add-a-little, oops-too-much method.)

 


Alternate Method - Lower Unit Pump

(Thank you @Dmarko) 

Use a "lower unit quart pump" to pump fluid directly from the ATF container into the transmission:

The pump screws into the quart bottle that the fluid comes in, insert the discharge end into the transmission and pump until the fluid drops by the amount the transmission needs (there is usually a fluid level indicator on the bottle). Clean out the pump by pumping soapy water through it and you're done.