If the boom shown in the illustration can be...

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Question 1 of 205eccef9cbacbc34ba4d459ed

If the boom shown in the illustration can be raised, but not lowered, the problem is most likely with the "Topping Circuit" ________. See illustration GS-0161.

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Question 1 of 20

5eccef9cbacbc34ba4d459ed

If the boom shown in the illustration can be raised, but not lowered, the problem is most likely with the "Topping Circuit" ________. See illustration GS-0161.

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🔍 Key Concepts

• Study how the topping cylinder raises and lowers the boom in the GS-0161 hydraulic schematic. • Trace oil flow through the counterbalance valve and its internal ball check in both directions (raising vs. lowering). • Think about which component failure would allow full pressure to raise the boom but block or prevent controlled flow when trying to lower.

💭 Think About

• When the boom is raised, which port of the topping cylinder is pressurized and how does the return oil get back to tank? Follow that path on the drawing. • When the boom is lowered, which way must oil flow through the counterbalance valve, and what would happen if the internal check element could not change state? • For each answer choice, ask: would this failure affect both directions of movement, or mainly the lowering motion only? Eliminate those that would stop both raising and lowering.

✅ Before You Answer

• Verify in the schematic which symbol represents the topping circuit counterbalance valve and where the ball check is drawn inside it. • Confirm which component(s) directly control boom angle versus those that simply supply system pressure (like the main pump). • Check that your chosen option explains why the boom can still be raised normally but cannot lower, rather than the reverse or a total loss of motion.

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Question 1 of 205eccef9cbacbc34ba4d459ed

If the boom shown in the illustration can be raised, but not lowered, the problem is most likely with the "Topping Circuit" ________. See illustration GS-0161.

Back

Question 1 of 20

5eccef9cbacbc34ba4d459ed

If the boom shown in the illustration can be raised, but not lowered, the problem is most likely with the "Topping Circuit" ________. See illustration GS-0161.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed