Chicago Pneumatic CP9430 Instruction Manual/Safety Instruction page 9

cylinder is horizontal and the motor pump vertical, loosen the cap (518), remove the bearings and springs
and blow inside to thoroughly clean it. Next, reassemble and if necessary knock the bearings again (40)
and (521), repeat the bleeding operation illustrated on the previous page and put the jack back into its
normal position and reopen the tap.
C) Check the hydraulic block (1052 CP9430) (1152 CP9460), paying special attention that the pistons (89) and
(264), which control
opening and closing of the descent valves, have not become rigid, in which case dismantle them and
grease them.
3) THE JACK LIFTS, BUT COMES DOWN UNDER THE LOAD.
A) Dismantle the assembly (1052 CP9430) (1152 CP9460) and check that under the valves (40) and (83) there
are no impurities, then, after carefully cleaning, readapt the pin (83) in its seat with a light blow with a hammer. If it
is not possible to obtain a seal on the pin, replace the valve (265) complete with the pin (83). If the load still falls
even after fitting the jack, carry out the following step.
B) Completely drain the tank and the cylinder of oil, loosen the cylinder and check the washer (1026 CP9430)
(0210 CP9460); if it is damaged, replace it. Refit everything and tighten the cylinder. Fill the oil tank with oil to the
required level; operate the jack a couple of times without the load; bleed and then top up the oil level when the
pistons are lowered.
4) THE RAMS FAIL TO GO BACK IN COMPLETELY EVEN WITH THE LEVER IN THE
DESCENT POSITION.
A) Check the suction-pump (935) and check that the piston (130) slides well: it is a good idea to grease or
lubricate it; unscrew and, if necessary, clean the silencer (267), then screw it back down.
B) Carry out 3B, but only in relation to the pistons.
5) OIL LEAKS
A) If the jack expels oil from the silencer (719 CP9430) (1109 CP9460), it means:
the pumping element (705 CP9430) (1104 CP9460) is scored or damaged and must be replaced; the seal (1002
CP9430) (1106 CP9460) is worn and must be replaced.
B) Oil leaks from the suction pump (935): check for the excess oil in tank. If the jack has been turned
upside down or damaged the leak will soon stop;
C) If oil is leaking from the silencer (267) and point B has failed to solve the problem, you must check the
integrity of the hydraulic block (1052 CP9430) (1152 CP9460): replace the seals (90) and (26). If the leak still
persists, replace the whole unit (1052 CP9430) (1152 CP9460).
6) OTHER CASES.
A) If the pistons lift up very slowly check that the tap 843 between the tank and motor pump is open.
B) If the jack is malfunctioning when lifting or lowering, check the spring (1046), the rubber ball seal (429)
and the smooth sliding of the piston (130).
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