10
TO ASSEMBLE VALVE CASING
18. Check O-rings (39A) and sup
-
port rings (39B) on seal case
(39). Clean surfaces of seal
sleeves (38) in crankcase (1)
and sealing surfaces of valve
casing (50). Insert seal sleeve
with plunger into crankcase
guide. Turn crankshaft to (22)
until plunger with crosshead
(25) pushes against plunger
tighten plunger (36) to 33 ft-lbs
(45 N-m).
19. Push valve casing carefully over O-rings of seal case and centering studs (50A). Tighten nuts (49A) to space
103 ft-lbs (140 N-m).
TO DISMANTLE REDUCTION GEAR
Remove screws (K4). Remove the gear cover (K2). It may be necessary to tap the cover off with a rubber
mallet. Remove screw (K11) and take off the spacer ring (K7) and tension disc (K10). Push the cogwheel
(K9) off the shaft by screwing two screws into both thread bores. Unscrew hexagon screws (10) and remove
the shaft cover (21) and bearing cover (14). Finally, take the crankshaft (22) out of the crankcase by tapping it
towards the bearing cover side, opposite the gearbox, using a rubber hammer.
Check the surfaces of connecting rods (24), crankshaft (22) and crossheads (25). Check the surfaces of the
crosshead guides in the crankcase for any unevenness.
Reassemble in reverse order. Regulate axial bearing clearance to a minimum of 0.1mm and a maximum
0.15mm by means of fitting discs (20A). Insert the crankshaft by passing it through on the bearing cover side.
Press in the outer bearing ring (20). The crankshaft should turn easily and with little clearance. Fit the bear-
ing cover (14) and tighten screws (24) to 30 ft.-lbs. (40 Nm).
Important!
The connecting rod has to be able to slightly move sidewise at the crankshaft journal.
Heat the ball bearings (K13) before pressing them onto the pinion (K12). Slightly press the cogwheel (K9)
onto the crankshaft, so that the pinion (K12) together with the bearing (K13) can still be inserted.
When mounting, place the pinion (K12) onto the cogwheel so that they correctly interlock. Carefully tap
the cogwheel and the pinion simultaneously onto the crankshaft and into the bearing seat.
Fit tension disc (K10), and spacer ring (K7) and tighten screw (K11) with Loctite.
Fit seal (K14) on to the cylindrical pins (K3).
Push the gear cover (K2) carefully on to the bearing (K13). Make sure the radial shaft seal (K17) does
not get damaged during fitting on to the pinion.
Important!
Before putting into operation again, turn the reduction gear shaft by hand at least four full turns
to make sure that the gear is correctly aligned.
GP7522GB REPAIR INSTRUCTIONS
39A
39
39A
Summary of Contents for GP7522GB
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