Double Wrench Method - JLG H340AJ Service And Maintenance Manual

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS

Double Wrench Method

To prevent undesired hose or connector rotation, two
wrenches must be used; one torque wrench and one back-up
wrench. If two wrenches are not used, inadvertent component
rotation may occur which absorbs torque and causes
improper joint load and leads to leaks. For hose connections,
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the 'layline' printed on the hose is a good indicator of proper
hose installation. A twisted lay-line usually indicates the hose
is twisted. See Figure 5-12. for double wrench method require-
ments.
Figure 5-12. Double Wrench Method
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