Piping; Hydraulic Hose; Precautions In Tightening The Bolts And Nuts - Kubota K008-3 Workshop Manual

K008-3, U10-3
c. Piping
(1) General precautions
• Tightening the pipe socket to the specified torque. If too tight, the socket itself or a hydraulic component
may get damaged. It too loose, an oil leak may occur.
• In connecting a new hose or pipe, tighten its nut first to the specified torque and then turn it back (about
45°). Then tighten it again to the specified torque. (Do not to the sealing tape-applied hose or pipe.)
• When disconnecting a vertical hose or pipe, separate its bottom connection first.
• In desconnecting and reconnecting the hose and pipe, be sure to use two wrenches. With one wrench,
restrain the mating part to allow no twist.
• Check the mating connector's sleeve and the hose's taper for dust deposits and scratches.
• When the pipe socket has been tightened up, wipe the joint clean. Apply the maximum operating pres-
sure
• 2 or 3 times to make sure there is no oil leak.

(2) Hydraulic hose

Check the hydraulic hose for too tight a connect or twist.
*Excessivly tight contact
Let's suppose that a hose is in contact with another hose or other part. If the hose is pulled away by a force
of 2 kg but still in contact, it means the contact is too tight.

(3) Precautions in tightening the bolts and nuts

• Use bolts of specified length.
• Do not over tighten the bolts: Its threads may get deformed or the fixed part may get damaged. Do not
undertighten the bolt either: It may get loose.
• In other words, tighten the bolt to the specified torque.
• Tighten the bolts and nuts diagonally for even tightness.
1
2
3
4
5
7
6
1 Joint body
2 R (Tapered thread)
3 G (Straight thread)
4 Nut
5 Sleeve
6 Steel pipe
7 Union nut
8 Tapered thread
I-S-11
I. GENERAL
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