T
echnical
M
anual
hD8625 8-
5
/
8
” 35K T
ong
4.3
T
roubleshooTing
PROCEDURE:
a. Isolate your tong from hydraulic power, and depressurize following the procedure in section 3.D
b. Loosen the locking nut on the pressure relief valve.
c. Use a large flat-head screwdriver to completely un-thread the poppet and spring from the relief assembly.
d. Inspect the relief valve spring, poppet, and valve seat.
e. If no debris is found in relief valve and if seat and poppet are undamaged, replace relief valve spring.
f.
Reassemble relief valve.
g. Relief valve must be re-set to allow maximum system pressure. Follow the procedure in Step 1 of this section to properly adjust relief
valve.
h. If maximum system pressure still cannot be reached, replace the entire relief valve assembly.
POSSIBLE PROBLEM
SOLUTION(S)
2
Relief cannot be adjusted to maximum system pres-
sure (high fluid bypass results in low system pressure
Debris on valve seat
Valve spring is broken
Valve spring has lost spring force due to continuous tension
RELIEF VALVE IS INCORRECTLY SET OR NOT FUNCTIONING Cont’d:
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 ...
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