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Before starting to prime this type of system, (only necessary after being drained empty): first clean off all dirt from around valves. 

WARNING NEVER slack a relief valve if there is any pressure in the system. The "0" rings on the valves will be damaged. To release pressure refer to section B (Dismantling hydraulic system) 
Screw the valves out but leave them sitting in the cavities (FIG 23 and 24). Then gently operate the priming pump, gently to expel all air out of the cavities; Only screw the valves back in when there is zero pressure in the system. (to avoid damaging the 0 rings). Tighten valves and proceed to prime and bleed the system as described at D: PRIMING. 

NOTE If it is required to disconnect the action between the front and rear rams on the later type valve block then proceed as follows: two flow restrictors are fitted in the front surface of the valve block: slack the lock nuts and unscrew centre part of restrict or a few turns using a 5mm Allen key (see fig 25) 

FIG 24

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