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5
To Check Seals and Plungers
Unscrew hexagon screw (59) and take off valve casing (54.) Remove the screw-in joints (37B) and take off the elbow pipes
(37A). Remove drip-return ring (44) from seal sleeve (36). Then pull seal sleeve (36) out of the crankcase.
Take the seal tension spring (41) out of seal sleeve (36). Using pliers, remove the clip ring (32) situated on the other side of the
sleeve; then take out support ring (33) and grooved ring (35) using an extractor tool (Æ12, Æ14, or Æ16 as per plunger Æ).
Using a seal extractor tool (Æ12.4, Æ14.4 or Æ16.4 as per plunger Æ), carefully press the seal unit comprising of guide ring (38,)
spiral ring (39,) and supporting ring (40) out of the seal sleeve (36) from the side (36) closest to the drive. Check spiral ring
(39), guide ring (38) and grooved ring (35) and replace where necessary.
Check surface of plunger (29) for damage.
A worn plunger (29) must be screwed out (key size 22) and replaced. Due to reasons of precision, the ceramic plunger alone
cannot be exchanged.
Coat the threads of the plunger lightly with an appropriate bonding agent and tighten plunger to 33 Ft-lbs. (45Nm).