36. Insert the crankshaft (#22) with the mounted bearings (#20) through the near side of the crankcase
(#1). Make certain that the numbers (or colors) or the crankshaft correspond to the numbers (or colors)
on the connecting rods (#24). Reinstall the near side bearing race by inserting it into the crankcase.
Supporting the crankshaft with one hand, tap the race with a rubber mallet until the edge is flush with
the crankcase.
37. Replace any shims (#20A, 20B) and position the bearing cover (#14) as before. Tighten the bearing
cover bolts (#17) evenly to position the bearing race. Torque the bolts to 125 inch-pounds. Once the
crankshaft reassembly is complete, oil the crankshaft races freely before replacing the connecting rod
(#24) end caps.
38. Reassemble the connecting rods (#24), matching the numbered (or colored) halves. Torque the con
-
necting rod bolts (#24A) to 250 in-lbs. (28 Nm).
39. To replace the oil seal (#31) apply Locktite to the outside edges of the seal and install from the front
of the crankcase (#1). The side of the seal with the spring must face the oil. Make sure that the face
of the seal is flush with the crankcase.
Reassembly Sequence
REPAIR INSTRUCTIONS - MP-4120-SWS/MP4124-SWS
40. Clean the back edge of the crankcase and replace the crankcase cover (#4). be careful not to pinch
the crankcase cover o-ring (#5).
41
. Fill the crankcase with 32 fluid ounces of Giant oil or the equivalent SAE 80W-90 Industrial Gear oil
and check the oil level with the dip stick (#8). The proper level is center of the two lines. Reinstall the
Giant pump into your system.
MP4120-SWS/MP4124-SWS TORQUE SPECIFICATIONS
NOTE: Contact Giant Industries for
Service School Information.
Phone: (419)-531-4600
11
Position
Item#
Description
Torque Amount
1
06100
Crankcase
Loctite 270
N/A
10
01010
Screw, Crankcase Cover
N/A
221 in.-lbs. (25 Nm)
12
07109
Oil Drain Plug
30 ft.-lbs. (40 Nm)
17
07114
Hex Screw, Bearing Cover
221 in.-lbs. (25 Nm)
24
07253
Hex Screw, Connecting Rod
106 in.-lbs. (12 Nm)
29C
13007
Bolt, Plunger
Loctite 243
247 in.-lbs. (28 Nm)
31
07260
Crankcase Oil Seal
Loctite 403
N/A
42A
06102/06103 Plug, Inlet
107 ft.-lbs. (145 Nm)
48
06108/07356 Plug, Discharge
107 ft.-lbs. (145 Nm)
50
07158
Nut, Manifold Stud
59 ft.-lbs. (80 Nm)
