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4 - 5

Assembly (cont’d)

6 Apply grease to a new 'O'-ring F and install it on the

rear end of shaft B.

Clean the metallic face of the seal E, coat the metallic

face with engine oil and install the hub C onto the shaft

B. Fit new wire clip G .

Wrap sealing tape around the plug H with one thread

remaining uncovered. Insert this plug into the hub C but

leave the other one out until after testing.

7 Using extreme care to prevent water entering the

assembly, lower it into a tank of water. Connect

compressed air at B and apply pressure of 1.9 bar (28

lbf/in

). Check for air bubbles.

If leakage occurs, replace seals.

8 Remove the assembly from the tank. Dry with

compressed air. Add engine oil via plug C aperture.

Install plug H using an appropriate pipe sealant.

9 Carry out steps 1 to 4 of Idler Wheel and Recoil Unit,

Replacement.

Section J Track and Running Gear

9803/6020

Section J

4 - 5

Issue 1

Idler Wheel

284260

284340

jcb JS70 Service Manual

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