C1 – up to 100t

80t allterrain Demag AC 80 (AC 205)

Demag AC80

Note: Assessment instrument will be changed from Jan 1st, 2013.

In addition to general questions, Assessment for C1 includes correct understanding of a given load chart, sample of which we are including here. Please note that the picture on right is NOT a full load chart, download link is below.

Load Chart questions and answers are below.

Load Charts for up to 100 t – download .pdf file below for your reference:

Load Chart “Z”

Questions:

Refer to Load Chart (Z).
A crawler crane with load chart (Z) is set up as follows:
• Main boom length 39.62 metres
• Working radius 12.00 metres
• Work area 360 degrees
• 12.19 metre length jib erected with 300kg ball hook
• Three sheave hook block on main hoist rope.
What is the maximum load that can be raised on the MAIN hook?
(Workings and adjustments must be shown in your written answer).

Answer:

Refer to Load Chart Z.
*Adjustments:
-Three sheave hook block 900 kg
-No adjustment for 300 kg ball hook (Deduction is included in the jib)
-Total deduction: 900 kg

-39.62 metre boom with 12.19 metre jib erected with 300kg ball hook at 12.00 metre radius:
-SWL 13400 kg
-Deductions 900 kg
-Maximum load: 12500 kg

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Refer to Load Chart (Z)
A crawler crane with Load Chart (Z) is set up as follows:
• Main boom length 45.72 metres
• Working radius 12.00 metres
• Work area 360 degrees
• 18.29 metre length jib erected with 300 kg ball hook
• Three sheave hook block on main hoist rope.
What is the maximum load that can be raised on the MAIN hook? (Workings and adjustments must be shown in your written answer).

Answer:

Refer to Load Chart Z.
*Adjustments:
-Three sheave hook block 900 kg
-No adjustment for 300 kg ball hook
-Total adjustment: 900 kg
-45.72 metre boom with 18.29 metre jib erected, with 300kg ball hook at 12.00 metre radius:
-SWL 12700 kg
-Deductions 900 kg
-Maximum load: 11800 kg

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100t grove GMK 4100

100t grove

Refer to Load Chart (Z)
A crawler crane with Load Chart (Z) is set up as follows:
• Main Boom length 54.86 metres
• Working Radius 23.00 metres
• Work area: 360 degrees
• Five sheave hook block fitted on the main hoist rope.
i. What is the maximum load that can be raised on the MAIN hook?
ii. Determine whether the crane can lower the entire boom length to the ground.Explain your answer determining the appropriate zone to lower the boom in.
iii. State whether mid point suspension (centre hitch) supports are required for this boom length.
iv. Identify which boom sections require replacement when re-configuring the boom length to a 48.77 metre length.
(Workings and adjustment must be shown in your answer).

Answer:

Refer to Load Chart Z.
*Adjustments:
-Five sheave hook block 1400 kg
-Total adjustment: 1400 kg
-i. 54.86 metre boom at 23.00 metre radius: SWL 4900 kg
-Deductions 1400 kg
-Maximum Load: 3500 kg
-ii. Yes, the crane can lower the boom to the ground only in the front and rear zones.
-iii. Yes, mid point suspension (centre hitch) supports are required when the boom length is 51.82 metres or longer.
-iv. The boom section ‘B’ (6.10 metre length) needs to be removed.