HYDRAULIC SYSTEM 16000 SERVICE/MAINTENANCE MANUAL
2-12
Published 05-09-17, Control # 014-28
Table 2-5 ORS Leakage
Split Flange Connection
1. Lubricate and install O-ring in shoulder groove (see
Figure 2-14
). Align shoulder with port and assemble
flanges over shoulder.
NOTE: Bolts used must be grade-5 or better. Grade-5 bolt
has three dashes in head.
2. Snug bolts in a diagonal manner (Figure 2-14
) to 1/3 of
torque given in Table 2-6
.
3. Repeat step 2 to 2/3 of final torque. Repeat step 2 to
final torque.
Table 2-6 Split Flange Assembly Torque
Table 2-7 Split Flange Leakage
Causes Cures
Nut Loose. Tighten to proper torque.
O-ring cut. Replace.
O-ring wrong size. Replace with proper size.
Sealing surfaces gouged or
scratched.
Repair if possible or
replace damaged parts.
Sealing surfaces dirty. Clean and lubricate.
Port
Shoulder
Flange
O-Ring
FIGURE 2-14
S104
1
2
3
4
S101
Tube
"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
2-1/16 (52,4) -16 325 – 425 37 – 48
2-5/16 (58,7) -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 bolts evenly to proper
torque.
Flanges tightened unevenly
causing extrusion of O-ring.
Replace O-rings. Tighten
bolts evenly to proper torque.
O-ring cut. Replace.
O-ring wrong size. Replace with 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 bolts after
system is hot.
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