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Mine lowers slower than that with me standing on it. But lowers faster (ok) with an imlement. Quoting from my service manual:
Ramshaft: This is removed complete with right-hand ramshaft bracket and control valve.
Remove cover from control lever housing. This is attached by four screws and must be removed complete with lowering control knob. Remove nyloc nut from connecting link and remove the three bolts attaching houssing to rear axle case: two of these are positioned inside the housing but the third is outside, and it will be necessary to release the three quadrant bolts to provide sufficient clearence to remove this bolt. Disconnect hand brake lever so it can be romoved with housing. Withdraw housing, noting that a distance piece and spring are fitted on connecting link.
Release locknut on lubrication pipe clamp bolt and unscrew bolt approx. eight turns. Wire pipe to upper housing bolt hole so that it will not come out of its connection at inner end and fall into axle case.
Disconnect flexible cable from sensing unit, then remove sensing unit. Cover top of pto case to prevent any dirt entering.
Removing control lever housing will expose the pressure pipe connection and enable the two attachment bolts to be removed , so that when control valve is withdrawn rearwards the pipe connection will remain in position.
Disconnect leveling and lift levers from lower links and remove cover from right-hand ramshaft bracket.
Remove bolts attaching right-hand ramshaft bracket to axle case and left-hand cover to ram cylinder.
The cover joint is vertical and two of the cover bolts pass right through the axle case. When the cover is removed a small quantity of oil will be released. 1 liter
Unscrew lowering control needle valve from front of control valve, to prevent it being damaged, then, whilst supporting the weight of the shaft with a portable crane, carefully withdraw the assembley rearwards until the control valve is clear of the axle case.
To separate ramshaft from its righ-hand bracket remove the two nuts attaching cam plate to ramshaft then slide bracket off shaft end.
Before commencing to replace the ramshaft, ensure that the lubrication pipe is in position inside the axle case and has not become detached at its left-hand (inner) end. Clean the joint faces and fit a new gasket on right-hand bracket.
Fit the two small 'O' rings into their positions at front of control valve: a smear of grease will help to maintain rings in position whilst ramshaft is being refitted.
Carefully raise ramshaft into position, guiding control valve into axle and ensuring that control lever rod passes through axle case. Place bearings in position on left-hand bracket then push shaft 'fully home'.
When shaft is in position, replace and tighten bracket bolts. Smear core plug with jointing compound before replacing it in left-hand bracket. Remove retaining wire from lubrication pipe then position pipe and tighten clamp bolt. Replace lowering control needle valve before bolting high pressure pipe connection to valve.
Refit control lever housing, using a new gasket. Spring and distance piece must be fitted on control valve rod as housing is replaced and an easy way of doing this is to place spring on rod, then temporarily fit a bolt through control lever pin so that disstance piece can be held in position whilst it is pushed against spring. When housing is bolted in position replace second distance piece and set connecting link.
Refit sensing unit, connect and adjust flexible cable. Selectamatic Control Valve: having removed the right-hand ramshaft bracket, remove the guide bracket: This is attached by two bolts, one of which is also the pivot for the cable actuation lever. Removing the guide bracket will expose a valve securing bolt and when this bolt and the two nuts are removed the valve assembly can be tapped off its dowels and separated from the ramshaft bracket.
When refitting a valve assembly, guide the rocker lever into position over abutment block whilst fitting valve onto dowels then replace bolt and nuts, tightening them evenly and firmly.
When valve is in position on bracket, check the settings of abutment block and TCU screw.(see page 27)
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