Maintanance, Service, and Troubleshooting
Canrig Drilling Technology Ltd. 6-9
Under continuous operating conditions, oil temperature must not exceed 180°F (82°C) at any point in the
system. An oil temperature range of 120 – 140°F (49 – 60°C) is generally considered optimum.
Anti–wear type hydraulic oils developed and evaluated on the basis of standard pump wear tests such as
ASTM–D2882 are recommended (Table 6-1). These oils offer superior protection against pump and motor
wear, provide good demulsibility, and protect against rust.
Skate Cable Monthly Maintenance
Check Tension
Monthly, use the following procedure to check and adjust skate cable tension.
1. Move skate to the rear of carrier.
2. Lift carrier up the ramp part way so the underside of carrier can be inspected.
3. Install the safety stop bar.
4. Slowly run skate forward while watching the cable. The cable will momentarily become slack as the
cable wraps on the skate winch drum and moves across the drum from one side to the other. At its
lowest point, the cable should not hang more than four (4) inches below the underside of the carrier
frame.
5. Tighten the cable by removing the locking plate at the rear of the carrier, and then equally threading in
the cable tensioner bolts. Do not overtighten the cable.
Table 6-1: Recommended Hydraulic Oil Grades for Various Temperatures
Ambient Temperature °F (°C) ISO Oil Grade
–49 to 59°F (–45° to 15°C) 15
–4 to 59°F (–20° to 15°C) 22
50 to 95°F (10° to 35°C) 32
68 to 113°F (20° to 45°C) 46
77 to 131°F (25° to 55°C) 68
NOTE: Hydraulic oil must be maintained at a minimum cleanliness
level of 18/16/13 (per ISO 4406) for normal ambient temperature
ranges. When operating at temperatures below 0°F (-18°C), a
17/15/12 level must be maintained to compensate for cold starts.
NOTE
ALWAYS move the skate forward, then backward
(or visa versa) for a minimum of 15 ft (4.6 m).
NEVER tighten the cable so much that you do not
see a momentary drop in the cable when reversing
the skate travel.
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