JLG 1850SJ Service And Maintenance Manual page 405

Hide thumbs Also See for 1850SJ:

Table of Contents

BLOCK SPRING, AND WASHERS

If cylinder kit was fully dissembled, visual inspection of the cyl-

inder block, spring, and washers should indicate minimal wear.

Replace if cracks or other damage is present.

Cylinder block spring

CYLINDER BLOCK

Examine the running face of the cylinder block. The surface

should be smooth and free of nicks and burrs. Ensure that no

scratches or grooves exist; these may drastically reduce output

?at to 0.002 mm

[0.000079 in]

Minimum cylinder block height (A)

Maximum block bore diameter (B)

Carefully examine the plug(s) for signs of wear. Also check the

small tip of the plug(s) for heavy wear and replace if necessary.

Inspect each spool's springs to make sure they are intact.

Check the inside and outside surfaces of the springs for wear

and replace if necessary. Check the spool's outside diameter

SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS

Spring retainer

Retaining ring

for scratches and / or burrs. Clean and coat all spools, bores,

and seals with a light coating of hydraulic oil.

Check to see that the shaft (J010) and its splines are straight

and free of damage or heavy wear. Inspect the shaft surface

where it meets the shaft seal. Replace the shaft if a groove

exists at the sealing land surface that may let dirt into or

hydraulic fluid out of the unit. Clean the sealing area with a

nonabrasive material if necessary. Lubricate the shaft with a

light coat of hydraulic fluid.

Troubleshooting