8.0 Maintenance Guide
28
8. Place the lower bearing (S-706) on the spindle and tap in the spindle and bearing
simultaneously. Use the wood block from the previous step to protect the spindle.
9. Replace the chip chute and pulley.
8.4.2 Center Head Bearing Replacement
1. Raise head as far as possible by turning knob “C”.
2. Remove pulley “H”.
3. Remove chip chute “D”.
4. Remove cutting block from table.
5. Back off bolts “E” approximately 1/2” and slide head up on rods so there is enough clearance
between table and bottom of head to allow spindle to be removed (place block between table
and head to hold in up position).
6. Tap out spindle (down).
7. Tap out bearings (must use rod from opposite end of each bearing).
8. Tap the upper bearing (S-706) in place using a piece of wood between the hammer and the
bearing (an old drill block works fine).
9. Place the lower bearing (S-706) on the spindle and tap in the spindle and bearing
simultaneously. Use the wood block from the previous step to protect the spindle.
10. Replace the chip chute and pulley.
11. Adjust head for drill depth.
8.5 Hydraulic
Through normal use, hydraulic systems gum up and seals wear. Signs of wear are hydraulic leaks
and erratic operation of the vertical speed. Check with your Authorized Challenge Dealer for a
current repair and/or replacement policy. Replace oil yearly. (Capacity: 1-1/2 Quarts/1.4 liters)
NEVER USE Automatic Transmission oil or brake fluid as a substitute!
Oils other than the recommended type will cause seals, cups and O-rings to deteriorate. Unsafe
operating conditions will result.
8.5.1 Recommended Oils
Oil Name Distributor
Rykon No. 100 AMOCO
Duro AW Oil 465 Arco
AW Machine Oil 100 Chevron
Pacemaker XD No. 100 Citgo
Super Hydraulic 100 Conoco
Nuto H-100 Exxon
Harmony 100 AW Gulf
HO 2A Hydraulic Oil Lubriplate
DTE No. 18 Mobil
Pennzoil AW 100 Pennzoil
Magnus A Oil 215 Phillips
Tellus 100 Shell
Energol HLP 100 Sohio
Industron 100 Std. Oil Indiana/Boron
Sunvis 851 WR Sunoco
Rando HD 100 Texaco
Unax AW 100 Union Oil Co.
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