Start system, Prime drilling fluid pump, Jt20 operator’s manual – Ditch Witch JT20 User Manual
Page 91
Conduct a Bore - 90
JT20 Operator’s Manual
Start System
CMW
®
Start System
1.
Start drilling unit and remote fluid unit. Allow both engines to warm up.
2.
Enable tracker control mode if desired. See “Tracker Control” on page 123.
3.
Press top of drilling unit throttle switch until engine is at full throttle. If you do not want to use
autothrottle mode, return switch to center position.
Prime Drilling Fluid Pump
Prime drilling fluid pump each time tank is changed. To prime the pump:
1.
Fill drilling fluid hose and connect hose to unit.
2.
Operate mixing/transfer pump at full speed for 1 - 3 minutes to discharge air from system.
3.
Return mixing/transfer pump to normal operating speed and continue the bore.
4.
If drilling fluid pressure surges are observed, repeat step 2.
IMPORTANT: Ensure that mixture of drilling fluid matches drilling conditions. See “Drilling Fluid”
on page 119.
Pressurized fluid or air could pierce skin and cause injury
or death. Stay away.
To help avoid injury, always prime the drilling fluid pump. Failure to prime the drilling fluid pump will
cause flow fluctuations, which will make it difficult to control the washwand.