Skytrak 6042 Service Manual User Manual download pdf (Page 93)

100

101

3.47

Model 6042 Legacy Origin 7/02

Boom

a. Inspection Guidelines

Expose the extend and retract chains (refer to

Section 3.4.1, b. “Expose Extend Chain for Inspection,”

or Section 3.4.1, c. “Expose Retract Chain for Inspec-

tion”) and inspect the chains for the following conditions:

Elongation

When the original length (Fig. 3-100, 1) of 12"

(305 mm) per foot of new chain has elongated from

wear to a length (2) of 12-3/8" (313 mm), the chain

must be discarded and replaced. (Refer to Section

3.4.5, Boom Extend and Retract Chains Removal

and Replacement.)

It is important to measure the chain in the section that

moves over the sheaves because it receives the most

frequent articulation. Measuring the chain near its

clevis terminals could give an inaccurate reading.

Measure across a span of 17 pins at the center of the

extend chain. Measure from pin center to pin center.

The maximum measurement allowed is 12-3/8"

(313 mm). If the measurement is more than 12-3/8"

(313 mm), the chain must

be replaced. (Refer to Sec-

tion 3.4.5, “Boom Extend and Retract Chains Remov-

al and Replacement.”)

Figure 3-100 Check for Chain Elongation

Edge Wear

Check the chain for wear on the link plate edges

caused by running back and forth over the sheave.

The maximum reduction of material must not exceed

5%. This can be compared to a normal link plate

height by measuring a portion of chain that does not

run over the sheave.

The new chain link measures .713" (18 mm)

(Fig. 3-101, 3). If the measurement of the worn chain

is less than .677" (17 mm) (4), the chain must be

replaced. (Refer to Section 3.4.5, “Boom Extend and

Retract Chains Removal and Replacement.”)

Figure 3-101 Inspect Link Plates for Edge Wear

Distorted or Battered Link Plates

Distorted or battered link plates (Fig. 3-102, 5) on a

leaf chain can cause tight joints and prevent flexing.

Figure 3-102 Inspect Link Plates for Distortion

MM2120

MM2051

MA9340

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