GP KFZ Series Istruzioni operative
KKFFZZ
Repair Manual
GENERAL PUMP A member of the Interpump Group KFZ SERIES
Page 2
INDEX
1. INTROD CTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3
2. REPAIR INSTR CTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3
2.1 Crank Mechanism Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 3
2.1.1 Crank mechanism disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 4
2.1.2 Crank mechanism assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 5
2.1.3 Disassembly/Assembly of bearings and shims . . . . . . . . . . . . . . .Page 6
2.2 Fluid End Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 9
2.2.1 Disassembly of the head - valve units . . . . . . . . . . . . . . . . . . . . . .Page 9
2.2.2 Head assembly - valve units . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 10
2.2.3 Disassembly of the head - seals . . . . . . . . . . . . . . . . . . . . . . . . . .Page 11
2.2.4 Plunger unit disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 12
2.2.5 Head assembly - seals - plunger unit . . . . . . . . . . . . . . . . . . . . . .Page 12
3.SCREW CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 13
4. REPAIR TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 14
5. MAINTENANCE LOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Page 15
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GENERAL PUMP A member of the Interpump Group KFZ SERIES
2. REPAIR INSTR CTIONS
1. INTROD CTION
This manual describes the instructions for repairing the KFZ Series Pumps, and must be carefully read and understood
before performing any repair intervention on the pump.
Correct use and adequate maintenance is fundamental for the pump’s regular operation and long duration. General
Pump declines any responsibility for damage caused by misuse or the non-observance of the instructions described in
this manual.
2.1 Crank Mechanism Repair
Crank mechanism repair operations must be carried out after draining the oil from the crankcase.
To drain the oil, remove the oil dipstick (1), and then the plug (2), in fig. 1.
Exhausted oil must be collected in an appropriate container and disposed of in appropriate
locations. n absolutely no case may it be disposed of in the environment.
GENERAL PUMP A member of the Interpump Group KFZ SERIES
2.1.1 Crank mechanism disassembly
The correct sequence is the following:
A) Dissasemble:
• pump shaft key
• rear cover
• connecting rod cap
• side covers, using 3 wholly threaded M6 x 50 screws, inserting
them in the holes as shown in fig. 2.
B) Push the plunger guides and connecting rods forward in order to facilitate the lateral extraction of the
crankshaft. Two marks are visible on the crankshaft (3), as shown in fig. 3 and fig. 3a; they must be turned
towards the operator in order to facilitate extraction.
NOTE: to extract the plunger guide it is necessary to remove the ceramic plunger, and wiper first.
C) Disassemble the crankshaft oil seals and the plunger guides using standard tools.
Page 4
fig. 3a
fig. 3a
GENERAL PUMP A member of the Interpump Group KFZ SERIES
Page 5
C) Before reassembly of the side covers, check the seal lips for wear. f replacement is necessary, position
the new ring using the correct tool (#F27904800) as shown in fig. 5.
f the shaft presents diameter wear corresponding to the sealing lip, to avoid the need for griding it’s
possible to position the ring as indicated in fig. 5.
2.1.2 Crank mechanism assembly
After cleaning the crankcase, reassemble the crankcase mechanism as follows:
A) Thoroughly fit the plunger guide seals into their seat on the crankcase as shown in fig. 5a using the proper
tool (p/n F27904900).
B) ntroduce the pre-assembled plunger guide/connecting rod units into their seat; to facilitate tightening of
the connecting rod cap, we advise to position the connecting rod so you can easily read the number. To
easily introduce the crankshaft, without the key, fully push in the plunger guide/connecting rod unit,
as indicated in section B, paragraph 2.1.1, and shown in fig. 4.
GENERAL PUMP A member of the Interpump Group KFZ SERIES
Page 6
D) nstall the connecting rod cap respecting numbering, and fasten the relevant bolts (lubricating both the
head and the threaded stem) proceeding in three different steps, see fig. 7.
1. Approaching torque 4-6 ft. lbs. (6-8 Nm)
2. Pre-fastening torque 18-20 ft. lbs. (25-28 Nm)
3. Fastening torque 28 ft. lbs. (38 Nm)
E) nstall the rear cover positioning the oil dipstick hole upward.
F) Fill the crankcase with oil as indicated in the owner’s manual paragraph 7.4
2.1.3 Disassembly / Assembly of bearings and shims
The type of bearings used (tapered roller bearings) ensures the absence of axial play on the crankshaft; the
shims are to be determined to reach this purpose. Tp disassemble/assemble, or to replace them if needed,
carefully follow the instructions below.
A) Disassembly/Assembly of the crankchaft without replacing the bearings
After removing the side covers, as indicated in paragraph 2.1.1, check the rollers and their faces for wear;
if all parts are in good condition, accurately clean the components with a suitable degreaser and grease
them again evenly using the same oil used in the crankcase.
The same shims can be used again, being careful to fit them under the cover on the sight glass side. After
Before assembling the cover (sight glass side), be sure that the shim rings have been inserted. To help the covers fit
onto the crankcase, we advise using 3 screws M6 x 40, and then finish the operation with the screws supplied (M6 x 18)
as shown in fig. 6.
GENERAL PUMP A member of the Interpump Group KFZ SERIES
installing the complete unit (sight glass flange + shaft + engine side flange), check that the shaft’s rolling
torque - with the connecting rods free - is a least 3 ft. lbs. (4 Nm), max 5 ft. lbs. (7 Nm). To position
the two side covers on the crankcase, initially use 3 screws, M6 x 40 as shown in fig. 6, and then the fastening
screws. The shaft’s rolling torque (with the connecting rods coupled) must not exceed 6 ft. lbs. (8 Nm).
B) Disassembly/assembly of the crankshaft with bearing replacement
After disassembling the side covers as indicated in paragraph 2.1.1, remove the outer ring nut of the
bearings from their covers and the inner ring nut, with the remaining part of the bearing, from the two shaft
extremities using a standard pin extractor or similar tool as indicated in figures 8 and 9.
The new roller bearing can be mounted at room temperature with a press or fly press; it is necessary to lay
them on the lateral side of the relevant ring nuts with correct rings. The driving operation can be facilitated
by heating the relevant parts at a temperature ranging between 2500-3000F (1200-1500C), making sure
that the ring nuts are correctly fitted into their seats.
Never invert the parts of the two bearings.
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GENERAL PUMP A member of the Interpump Group KFZ SERIES
Determine the shim pack as indicated in the table below.
Measurement Shim Type # Pieces
From: 0.05 to: 0.10 / /
From: 0.11 to: 0.20 0.1 1
From: 0.21 to: 0.30 0.1 2
From: 0.31 to: 0.35 0.25 1
From: 0.36 to: 0.45 0.35 1
From: 0.46 to: 0.55 0.35
0.10
1
1
From: 0.56 to: 0.60 0.25 2
From: 0.61 to: 0.70 0.35
0.25
1
1
E) nsert the shims under the cover on the sight glass side (see fig. 11), fixing it to the crankcase using the
appropriate screws, and verifying that the stall torque is between 3-5 ft. lbs. (4-7 Nm).
F) f the torque values is correct, connect the rods to the crankshaft; otherwise, reassemble the shims again
repeating the operations from point “C”.
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The shim pack must be redefined as follows:
A) nsert the crankshaft in the crankcase, being sure that the P.T.O. shank comes out of the correct side.
B) Fit the P.T.O. side flange to the crankcase paying great attention to the seal lip as indicated in paragraph
2.1.2, section C.
C) Position the flange on the sight glass side as indicated in paragraph 2.1.2.
D) Use a thickness gauge (see fig. 10).
A) Unfasten the 7 M12 x 35 valve cover screws, and remove the cover (fig. 12).
B) Extract the valve plugs using a slide hammer (part #F26019400) (fig, 12).
C) Pull out the valve assemblies by using the same tool (reverse hammer) as used for the valve caps
(part #F26019400 combined with the tool #F27513600).
Should the suction or delivery valves get stuck inside the manifold (i.e. due to inactivity for a long
period) make use of the extracting tool (part #F27516900 combined with the tool #26019400).
Disassembly the suction and delivery valve units by screwing on an M10 screw long enough to act on the
valve and extract the valve guide from the valve seats) 4, fig. 13.
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GENERAL PUMP A member of the Interpump Group KFZ SERIES
2.2 Fluid End Repair
2.2.1 Disassembly of the head - valve units
Service operations are limited to valve inspection or replacement if needed.
To extract the valve units proceed as follows:
2.2.2 Head assembly - valve units
Pay careful attention to state of wear of the various components; replace them when necessary, and
in any case within the intervals indicated in the table in fig. 14, Chapter 11 of the Owner’s Manual.
At each valve inspection, replace all valve units and valve plugs, o-rings and enti-extrusion rings.
Before repositioning the valve units,clean and perfectly dry the relevant seats in the head as indicated in
fig. 14.
GENERAL PUMP A member of the Interpump Group KFZ SERIES
Page 10
fig. 14
Proceed with reassembly by inverting the proceedure indicated in paragraph 2.2.1.
During the assembly of the suction and delivery valve units (fig. 15 - fig. 16) do not invert the suction
springs with the previously disassembled delivery springs:
a) Suction springs “white”
b) Delivery springs “black”
To facilitate insertion of the valve guide on the seat, you can use a pad placed on the horizontal surfaces of the
guide (fig. 16a) and drive it with a sliding hammer.
nsert the suction and delivery valve units checking that they are thoroughly inserted in the head seat. Apply the valve
covers and proceed with calibrating the related M12 x 35 screws with a torque wrench as indicated in Chapter 3.
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