HYDRAULIC SYSTEM 16000 SERVICE/MAINTENANCE MANUAL
2-12
Published 05-03-17, Control # 228-03
Split Flange Connection
To maintain a split flange fitting, use the following procedure:
1. Lubricate and install the o-ring in the shoulder groove
(see Figure 2-10
). Align the shoulder with the port and
assemble the flanges over the shoulder.
NOTE: Bolts used must be grade-5 or better. Grade-5 bolts
have three dashes on the head.
2. Snug bolts in a diagonal manner (Figure 2-10
) to 1/3 of
torque given in Table 2-7
.
3. Repeat step 2 to 2/3 of final torque. Repeat step 2 to
final torque.
Table 2-6
Split Flange Fitting Troubleshooting
Table 2-7
Split Flange Assembly Torque
Causes Cures
Flanges not tight. Tighten the bolts evenly to
proper torque.
Flanges tightened unevenly
causing extrusion of O-ring.
Replace o-rings. Tighten the
bolts evenly to the proper
torque.
O-ring cut. Replace.
O-ring 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. Re-tighten the bolts
after the system is hot.
Port
Shoulder
Flange
O-Ring
FIGURE 2-10
S104
1
2
3
4
S101
Tube
"A"
Dimension
inch (mm)
Flange
Size
Torque
Nm in-lb
Standard Pressure Series
1-1/2 (38) -08 175 to 225 20 to 25
1-7/8 (48) -12 225 to 350 25 to 40
2-1/16 (52) -16 325 to 425 37 to 48
2-5/16 (59) -20 425 to 550 48 to 62
2-3/4 (70) -24 550 to 700 62 to 79
3-1/16 (78) -32 650 to 800 73 to 90
3-1/8 (79) -24
1400 to
1600
158 to 181
3-13/16 (97) -32
2400 to
2600
271 to 294
High Pressure Series
1-9/16 (40) -08 175 to 225 20 to 25
2 (51) -12 300 to 400 34 to 45
2-1/4 (57) -16 500 to 600 57 to 68
2-5/8 (67) -20 750 to 900 85 to 102
3-1/8 (79) -24
1400 to
1600
158 to 181
3-13/16 (97) -32
2400 to
2600
271 to 294
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