HIGH PRESSURE PUMP REPAIR INSTRUCTION
SERIES EP-12-34 / EP-14-34 / EP-17-34
Disassembly sequence of the front end of the ECH
2
O Tec. high-pressure pump.
Refer to the pump diagram.
1)
Remove the three discharge valve plugs and the three inlet valve plugs (32), with a 22 mm socket
wrench. Inspect the O-ring (33) for wear and replace if damaged.
2)
With needle nose pliers, remove the inlet and discharge valve assemblies (32X). Insert a small
screwdriver between the valve seat (27) and the valve spring retainer (30) to separate the valve
assembly. Remove the O-ring (31). Inspect all parts for wear and replace if necessary.
3)
Next, use a 5 mm Allen wrench to remove the 8 socket head cap screws (34). Carefully slide the
valve casing (26) out over the plungers. Remove the weep return ring (25), pressure ring (24) and
V-sleeve with support ring (23), from the valve casing (26). Remove the V-sleeve (23) from the seal
case (20). Inspect all parts, including O-ring (21) for wear and replace if necessary.
4)
Check surfaces of plunger (16). A damaged surface will cause accelerated wear on the seals.
Deposits of any kind must be carefully removed from the plunger surface.
A damaged plunger must be replaced!
5)
If the ceramic plunger (16B) is damaged, remove the plunger bolt (16C). Discard the old plunger
(16B) and copper gasket (16D) and clean the old Locktite from the plunger bolt (16C) and plunger
base (16A). Replace the plunger with the new one and Locktite the plunger bolt and torque to 120
inch-pounds.
NOTE: If there are deposits of any kind (i.e., lime deposits) in the valve casing, be certain that the
weep holes in the weep return ring and valve casing have not been plugged.
6)
If the crankcase oil seals (19) are to be replaced, they can be removed by prying loose. Take care
not to make contact with the plunger. If the oil seals are not to be replaced, proceed to the back end
disassembly sequence and carefully pry the seals loose after the plungers have been removed from
the crankcase.
Disassembly sequence of the back end of the ECHO Tec. high-pressure pump.
1)
Before beginning, drain the oil from the crankcase, through the oil drain (3A).
2)
Remove the crankcase cover (3) and O-ring (4) from the crankcase (1). To remove the crankshaft
(13), remove the bearing cover (7) and sight glass (8). Using a rubber mallet, remove the crankshaft
axially through the connecting rods by tapping on the end of the shaft. Do not bend or damage the
connecting rods during crankshaft removal.
3)
Next remove the remaining bearing and radial shaft seal (11). Inspect both bearings and seal for
wear and replace if necessary.
4)
Remove the connecting rod (15), then the plunger (16) and wrist pin (17), if necessary. Check the
plunger bore in the crankcase for wear. Inspect parts and replace as necessary.
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