Volvo Maintenance Hints for 7xx/9xx - Bill Garland's Nuclear ...

Volvo AW-7X Transmission Valve Body
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Volvo Maintenance FAQ for 7xx/9xx/90
Cars Version 7.2
Aisin-Warner AW-7X Valve Body Service in a Volvo 7XX-940 Car:
Page 5
All information written by Brad Wightman and used by his kind permission.
15. Put each valve in your favourite cleaning agent (I used turps). Also put the valve body in to
soak as well. Rinse it out (I used just water) then blow it dry with compressed air being sure
to blow out all the passages and bores and ensure that it is completely dry before
reassembling.
16. Reassembly is simply a reversal of disassembling. Be careful not to confuse the orientation of
the valves (ie. don't put it in backwards). Some valves contain orifices in them that are very
small (sorry, don't remember which valves have them). The position of these holes in the
bores of the valve body does not appear to be critical. Torque the retaining plate bolts to 3.5 -
4.5 ft lbs. (5 - 6 Nm). Place it aside somewhere clean and turn your attention to the upper
front valve body.
17. Disassembling the upper front valve body follows a similar process to the upper rear valve
body. See pic below. The Volvo manual gives some details about disassembling this section.
A word of caution: On page 85 of the manual there is a warning about strong spring pressure
behind the cover retaining the secondary regulator valve and they're not joking. There is A
LOT of pressure behind that cover (the spring is quite beefy). This cover is located just above
the spring on the right hand side in the picture. Make sure you have a very good grip on the
cover and are VERY careful as you turn it to expose the valve otherwise you risk shooting the
valve across your garage.