Manitowoc MLC165-1 - Page 46

Reference Only
HYDRAULIC SYSTEM MLC165-1 SERVICE/MAINTENANCE MANUAL
2-22
Published 05-26-17, Control # 238-02
Split Flange Connection
1. Lubricate and install the O-ring in the shoulder groove
(see Figure 2-22
). Align the shoulder with the port and
assemble the flanges over the shoulder.
NOTE Bolts used must be grade-5 or better. A grade-5
bolt has three dashes in the head.
2. Snug the bolts in a diagonal manner (Figure 2-22
) to 1/3
of the torque given in Table 2-7
.
3. Repeat step 2
to 2/3 of the final torque. Repeat step 2 to
the final torque.
Table 2-7 Split Flange Assembly Torque
Table 2-8 Split Flange Connection Repair
A Dimension
inch (mm)
Flange
Size
Torque
in-lb Nm
Standard Pressure Series
1-1/2 (38,1) -08 175 – 225 20 – 25
1-7/8 (47,6) -12 225 – 350 25 – 40
Port
Shoulder
Flange
O-Ring
Figure 2-22. Split Flange Connection
1
2
3
4
Tube
S101
S104
A
S102
2-1/16 (52,4) -16 325 – 425 37 – 48
2-15/16 (74,6) -20 425 – 550 48 – 62
2-3/4 (69,9) -24 550 – 700 62 – 79
3-1/16 (77,8) -32 650 – 800 73 – 90
3-1/8 (79,4) -24 1400 – 1600 158 – 181
3-13/16 (96,8) -32 2400 – 2600 271 – 294
High Pressure Series
1-9/16 (39,7) -08 175 – 225 20 – 25
2 (50,8) -12 300 – 400 34 – 45
2-1/4 (57,2) -16 500 – 600 57 – 68
2-5/8 (66,7) -20 750 – 900 85 – 102
3-1/8 (79,4) -24 1400 – 1600 158 – 181
3-13/16 (96,8) -32 2400 – 2600 271 – 294
Causes Cures
Flanges not tight
Tighten the bolts evenly to
proper torque
Flanges tightened unevenly
causing extrusion of the O-
ring
Replace the O-rings.
Tighten bolts evenly to
proper torque
O-ring cut Replace
O-ring the wrong size
Replace with the proper
size
Sealing surfaces not
smooth; scratched or
gouged
Repair if possible or
replace parts
Sealing surfaces dirty Clean
Flanges keep getting loose
in service
Use SAE grade 5 bolts or
better. Retighten the bolts
after system is hot
A Dimension
inch (mm)
Flange
Size
Torque
in-lb Nm
A
S102