Treadwall
®
Service Bulletin #6: Valve adjustment
The brake-control valve on the Treadwall sometimes needs adjustment after the initial
break-in period. If there is any oil leakage from the stem of this valve, the gland nut must be
tightened.
1. Remove the top right fabric side cover.
2. Remove cover from hydraulic unit at top right of machine. The cover slips off to the right. It
is held in place by two lugs at the top of the frame.
3. With a 9/16" wrench, remove the long lever from the control valve. Note the orientation of
the lever before removing.
4. Refer to fig. 2 and locate the small setscrew and gland nut on the control valve. The small
setscrew (1/16" Allen wrench) keeps the gland nut from loosening during operation of the
Treadwall.
5. Loosen the small setscrew approximately 1 turn.
6. Tighten the gland nut with a 9/16" combination wrench or socket. It will only need to be
tightened a fraction of a turn. Tighten firmly but do not over-tighten.
7. Re-tighten the small setscrew. Do not over-tighten.
8. Replace the control lever arm onto the valve. Be extremely careful when replacing the
valve-stem nut - it is very easy to cross-thread. Tighten this nut firmly
9. Run the machine and check for leaks.
10. If the pump makes unusual noises and operates erratically, you may need to add oil.
Remove the filler plug at the top of the pump unit and check the level. The oil should come
to about 1/2" from the top. If the level is low, add 30 weight non-detergent motor oil
(available at auto-parts store - used in small four-cycle lawnmowers etc.) While adding oil,
run the machine around a bit to get out any air bubbles. You will probably end up with oil
right to the top. Make a little air-pocket for the filler plug by sticking your finger into the
opening (have a rag on hand!!) and replace the plug. Wipe off any excess oil..
11. When the machine is operating smoothly, close the control panel and replace the
side-cover.
Valve stem
Gland nut
Small setscrew
Control valve
Fig. 2 Valve (detail)
Summary of Contents for Treadwall AM
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