Bishamon STS15, Operation And Service Manual

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6. Routine Maintenance
1. Check for rust, crack and kink in chain (Monthly)
2. Grease to rail of post for roller, lubricate grease fitting of chain bracket and
chain. (every 6 months)
3. Lubricate handle bracket pin and bearings (Every 6 months)
4. Replace hydraulic oil. (Every 12 months)
Required Volume of Hydraulic Oil
STS15 ………… 0.35L STS38, ST38WN ………… 0.69L
ST20WW ………… 0.69L STL50 ………… 0.75L
STL25, STL38 ………… 0.55L ST50, ST50WN ………… 0.94L
ST25, ST30WW ………… 0.69L STL65 ………… 0.98L
STS38 ………… 0.47L ST65, ST80, ST100 ………… 1.23L
ST80WN, ST100WN
Recommended Hydraulic Oil
Esso Unipower SQ32, XL32, Mobil Mobil DTE24
Shell Caltex Rando Oil A
7. Trouble Shooting
1. Lack of oil Add the hydraulic oil
2. Air in the pump cylinder Remove air
Replace Lowering Valve
2. Lowering Valve is not closed Adjust the cable on the
Lowering Lever
3. Seating failure of steel ball Clean or replace steel ball
Replace the O Ring
Piston Rod
1. Lowering Valve is not open Adjust the cable on the
Lowering Lever Lowering Lever
1. Defective Dust Seal Replace Dust Seal
2. Wear in the O Ring Replace the O Ring
1. Defective Dust Seal Replace Dust Seal
2. Wear in the O Ring Replace the O Ring
At Valve Seat 1. Wear in the O Ring Replace the O Ring
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Oil Leak
At Pump Piston
At Top Nut
Forks do not lower by pulling
4. Wear in the O Ring on the Piston or
1. Seating failure of the Lowering Valve
Manufacturer Hydraulic Oil Manufacturer Hydraulic Oil
Trouble Cause Shooting
Tellus Oil 32, K32, W-R Oil 32
Natural Lowering
Forks do not rise without load