Great-plains FH6800HD Operator Manual User Manual download pdf (Page 31)

Great Plains Manufacturing, Inc. Maintenance and Lubrication 27

04/28/2014 564-070M

Hydraulic Maintenance

As with any hydraulic system, contamination is the most

common cause of performance problems and pre-

mature wear. Make a special effort to properly clean

quick couplers prior to attaching the hoses to tractor, and

never let them fall to the ground.

High Pressure Fluid Hazard:

Relieve pressure before disconnecting hydraulic lines.Wear

protective gloves and safety glasses or goggles when working

with hydraulic systems. Use a piece of paper or cardboard,

NOT BODY PARTS, to check for suspected leaks. Escaping

ﬂuid under pressure can penetrate the skin, causing serious

injury. If an accident occurs, seek immediate medical assis-

tance from a physician familiar with this type of injury.

Bleed only at JIC and NPT ﬁttings.

Never try to bleed a QD (Quick Disconnect) ﬁtting.

Avoid bleeding at ORB ﬁttings. The O-ring is likely to be

torn if any pressure remains in the circuit.

Crushing Hazard:

When reconnecting ﬁttings at fold cylinder ports, verify that a

0.063in (

⁄

in, 1.6mm) oriﬁce plate (Great Plains part number

196-430D) is installed at each port. A missing plate could

result in a dangerously fast unfold, which might result in

equipment damage, injury or death.

System Contamination Risk:

Always use liquid pipe sealant when adding or replacing NPT

(National Pipe Thread, tapered thread) pipe-thread ﬁttings. To

avoid cracking hydraulic fittings from over tightening, and to

keep tape fragments from clogging filters, do not use plastic

sealant tape.

Over-Torque and Leak Risks:

JIC (Joint Industry Conference 37° Flare) ﬁttings do not

require high torque. Excess torque causes leaks. JIC and

ORB (O-Ring Boss) ﬁttings do not require sealant.

JIC Torque Chart

Size Foot-Pounds N-m

⁄

-20 11-12 15-16

⁄

-20 15-16 20-22

⁄

-18 18-20 24-28

⁄

-16 38-42 52-58

⁄

-14 57-62 77-85

⁄

-12 79-87 108-119

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Great-plains FH6800HD Operator Manual User Manual Page 31

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