Page 340 - CTS - Mechanic Diesel - TP

MECHANIC DIESEL - CITS

6 Remove the suction valve seat or discharge valve seat with a seat puller and a seat puller jack.
7 Clean the valve seat deck thoroughly using a non-petroleum based cleaner.

8 Clean the replacement valve seat using a non-petroleum based cleaner. Do not apply any type of lubricant to
the seat or o-ring on the seat prior to installation.
9 Snap the replacement valve seat into the taper by hand to fit tightly

10 Place the winged valve on the top of the valve seat.
11 Bump the seat into the taper 2-3 times with a heavy bar to make the fit tight
12 Reinstall the valve spring and suction valve spring retainer cage.
13 Reinstall the suction valve cover and retainer nut.
14 Reinstall the discharge valve, spring, cover and retainer nut
15 Run the pump at 80% to 100% of the maximum discharge pressure until the seats “pop” into the fluid end
tappered holes (Listen for 6 distinct loud “pops”)
D Power end service

Before attempting to service the power end of the pump, the following safety precautions
1 Shift the pump transmission in to the neutral gear
2 Shut off the pump engine and remove the key from the ignition to prevent starting the engine
inadvertently.
i Extension Rod

1 Remove plunger guards.
2 Remove the plunger and push it into the fluid end.
3 Unscrew the extension rod with a pipe wrench on the knurled portion of the rod (be careful not to damage the
seal surface). Remove the extension rod through the top of the cradle section.

4 Check the extension rod seal for wear. Replace if necessary.
5 Before replacing the extension rod, inspect the threads in the cross head and check for cracks on the extension
rod. Apply a light coat of anti-seize to the extension rod threads.

6 Install extension rod in cross head.
7 Check to see that mating faces of extension rod and plunger are free of nicks or burrs. Any raised metal could
cause misalignment, resulting in poor packing life.

8 Replace the plunger as detailed in the previous section.
ii Connecting Rod Bearing
1 Remove the rear cover from the power end.
2 Remove the locknuts from each rod cap to be removed
3 Remove the rod cap, labelling each for correct re-assembly.
4 Using a rubber hammer or wooden hammer handle, tap on one edge of the bearing from the crank journal.

5 Check the crankshaft journal surface for wear or damage. Polish if necessary.
6 Clean the new bearings and connecting rod thoroughly before replacing bearings. The grooved bearing half
goes in the cap and the non-grooved half goes in the connecting rod.

7 Install the rod caps, making certain the correct cap is assembled with the correct rod.
8 Tighten the locknuts on the rod caps to apply correct torque.
Before the operating the pump, move the connecting rod from side to side with a large screwdriver
to make sure the rod is free on the crankshaft. If new bearings are installed, perform the Run-in”
procedure prior to field operation.

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CITS : Automotive - Mechanic Diesel - Exercise 18.5