T
echnical
M
anual
hD8625 8-
5
/
8
” 35K T
ong
2.15
IMPROPERLY SECURED HYDRAULIC CONNECTIONS WILL INTERRUPT HYDRAULIC FLUID FLOW, AND
COULD RESULT IN THE FOLLOWING FAILURES:
• A restriction in the pressure supply hose will result in high pressure within the power unit hydraulic system, which
will activate the hydraulic governor and increase the engine speed to as high as maximum RPM.
• A restriction in the return line will result in high pressure within the power unit and the tong hydraulic system, caus-
ing engine speeds as high as maximum RPM, and possible failure of the motor seal.
Following inspection of the hoses, start the engine and allow it to idle until warm. Allow hydraulic fluid to circulate for approximately 10
minutes, then slowly close the Bypass Valve to allow hydraulic fluid to circulate through the hoses and to the tong (circulating pres-
sure should not exceed 200 psi). Place the tong gear shifter in low gear and rotate the tong slowly forward and then reverse with the
throttle valve control lever. Once this has been done and the proper size jaws have been installed, the tong is then ready to run pipe.
2.
Valve Operation
4-way proportional valves control operation of hydraulic devices on the tong assembly such as hydraulic motors and cylinders. When
any one valve is “centered” or in the detent position, there is no hydraulic output from the valve. When the valve is pushed forward
there is an effect, and when the valve is pulled back, there is an opposite effect. These valves feature proportional control, which
means that further extension of the valve handle (thereby further opening the valve orifice) results in proportionally higher hydraulic
output to the controlled device.
The following illustration demonstrates the type and effect of the hydraulic valves with which this tong is may be equipped.
TONG MOTOR
This is a proportional valve. Pushing the valve handle forward will cause the tong motor to rotate in a clockwise direction (as seen
from the top of the tong). This is the desired direction of rotation for making up a joint. Pulling the valve handle in the opposite direc-
tion results in counter-clockwise rotation, which is the desired direction of rotation for breaking out a joint.
I
llustratIon
2.g.1: t
ong
r
otatIon
C
ontrol
v
alve
Ensure adequate lube oil and hydraulic oil levels before starting engine. Use start up procedures as recommended by the power unit
engine operator’s manual. Open the Bypass Valve on the hydraulic system, and inspect all pressure and return line hose connections
to ensure correct and secure installation.
s
eTup
& o
peraTion
Содержание HD8625
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Страница 83: ...Technical Manual HD8625 8 5 8 35K Tong 5 1 Parts and Assemblies HD8625 8 5 8 35K Tong ...
Страница 84: ...5 2 HD8625 8 5 8 35K Tong Technical Manual Gear Train Layout H B C D H J A K E F G ...
Страница 86: ...5 4 HD8625 8 5 8 35K Tong Technical Manual Support Roller A B D J C E H D E F G ...
Страница 88: ...5 6 HD8625 8 5 8 35K Tong Technical Manual Door Pivot Roller A B D J C E H D E F G ...
Страница 90: ...5 8 HD8625 8 5 8 35K Tong Technical Manual Rotary Idler Assembly A B C E B D F C D G G H J F ...
Страница 92: ...5 10 HD8625 8 5 8 35K Tong Technical Manual Pinion Idler Assembly A B C E L D F K G J G H ...
Страница 94: ...5 12 HD8625 8 5 8 35K Tong Technical Manual Pinion Assembly A B C E A D F B D G H E C ...
Страница 96: ...5 14 HD8625 8 5 8 35K Tong Technical Manual Clutch Assembly A B C D K T U V J L S P M N R E F G H K Q ...
Страница 98: ...5 16 HD8625 8 5 8 35K Tong Technical Manual Shifter Assembly A B C D E F G J H K L M N P Q R S ...
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Страница 102: ...5 20 HD8625 8 5 8 35K Tong Technical Manual Tong Leg Weldments A C D E F H G J B ...
Страница 104: ...5 22 HD8625 8 5 8 35K Tong Technical Manual Hydraulic Supports A J B C D E C F G H N P F K L M ...
Страница 106: ...5 24 HD8625 8 5 8 35K Tong Technical Manual Motor Motor Mount A B C D E J F G H Q K P L M N ...
Страница 108: ...5 26 HD8625 8 5 8 35K Tong Technical Manual Brake Bands A B C D E F G H J ...
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Страница 114: ...5 32 HD8625 8 5 8 35K Tong Technical Manual Rigid Sling Assembly A B C D E J K L Q P F G H N R M ...
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