4.2
hD8625 8-
5
/
8
” 35K T
ong
T
echnical
M
anual
T
roubleshooTing
B.
RELIEF VALVE IS INCORRECTLY SET OR NOT FUNCTIONING
d. Re-establish hydraulic power to your tong. Ensure that no equipment functions are active.
e. Loosen the locking nut on the pressure relief valve.
f.
Open the tong door to activate the safety door system and inhibit tong rotation.
g. Activate motor control valve. Observe the pressure displayed on the pressure indicator. Adjust the relief valve until the pressure indi-
cated is at the maximum system pressure specified on the specifications page (maximum system pressure is the pressure at which
your tong achieves its specified torque).
DO NOT ADJUST PRESSURE RELIEF TO A SETTING THAT ALLOWS HIGHER THAN MAXIMUM
SYSTEM PRESSURE. DOING SO CREATES A POTENTIAL FOR SERIOUS INJURY OR DEATH, AND
MAY CAUSE CATASTROPHIC EQUIPMENT FAILURE.
h. Release the motor control valve and tighten the locking nut on the pressure relief valve.
i.
Isolate your tong from hydraulic power, and depressurize following the procedure in section 3.D.
j.
Close the tong door, and remove the temporary pressure indicator. Restore the safety door pressure supply line to factory specifica-
tions. Verify that safety door is operating correctly (see section 2.I.5.k).
Continued on next page
I
llustratIon
4.B.1: r
elIef
v
alve
t
rouBlesHootIng
- t
emPorary
g
auge
I
nstallatIon
POSSIBLE PROBLEM
SOLUTION(S)
1
Relief pressure set too low, resulting in
insufficient tong torque
Adjust setting (See following procedure):
Relief pressure set too high, resulting in
crushed pipe or gear train failure
a. If your tong is equipped with a system pressure indicator proceed to step “f”. If your tong does not have a system pressure indicator,
a temporary 0 - 3000 PSI indicator must be installed on the hydraulic inlet.
b. Isolate your tong from hydraulic power, and depressurize following the procedure in section 3.D.
c. Tee in a temporary indicator at the safety door supply pressure port. Ensure all hydraulic connections are performed by a qualified
hydraulic technician.
Connect a temporary 0 - 3000
PSI pressure indicator at this
location
Summary of Contents for HD8625
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Page 83: ...Technical Manual HD8625 8 5 8 35K Tong 5 1 Parts and Assemblies HD8625 8 5 8 35K Tong ...
Page 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 ...
Page 86: ...5 4 HD8625 8 5 8 35K Tong Technical Manual Support Roller A B D J C E H D E F G ...
Page 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 ...
Page 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 ...
Page 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 ...
Page 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 ...
Page 102: ...5 20 HD8625 8 5 8 35K Tong Technical Manual Tong Leg Weldments A C D E F H G J B ...
Page 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 ...
Page 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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Page 133: ...Technical Manual HD8625 8 5 8 35K Tong 7 9 Hydraulic Components ...
Page 140: ...7 16 HD8625 8 5 8 35K Tong Technical Manual Hydraulic Components ...
Page 141: ...Technical Manual HD8625 8 5 8 35K Tong 7 17 Hydraulic Components ...
Page 142: ...7 18 HD8625 8 5 8 35K Tong Technical Manual Hydraulic Components ...
Page 143: ...Technical Manual HD8625 8 5 8 35K Tong 7 19 Hydraulic Components ...
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Page 145: ...Technical Manual HD8625 8 5 8 35K Tong 7 21 ...
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Page 147: ...Technical Manual HD8625 8 5 8 35K Tong 7 23 Hydraulic Components ...
Page 148: ...7 24 HD8625 8 5 8 35K Tong Technical Manual Hydraulic Components ...
Page 149: ...Technical Manual HD8625 8 5 8 35K Tong 7 25 Hydraulic Components ...
Page 150: ...7 26 HD8625 8 5 8 35K Tong Technical Manual Hydraulic Components ...
Page 151: ...Technical Manual HD8625 8 5 8 35K Tong 7 27 Hydraulic Components ...
Page 152: ...7 28 HD8625 8 5 8 35K Tong Technical Manual Hydraulic Components ...
Page 153: ...Technical Manual HD8625 8 5 8 35K Tong 7 29 Hydraulic Components ...
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