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45gpm Fixed Inline Piston Pump Repair


Put the whole unit with tubing into an arbor press with drive spline up. See Figure 20. Push the drive shaft through the bearing and out of the unit. A 0. 001 inch press exists linking the shaft and bearing so substantial force is necessary to remove the bearing from the shaft.

Remove yoke as follows: Remove yoke bearing parts (49 through 58). Be wary not to damage the seal on the long pintle during removaL If burrs are present on the pintle, clean-up with an India stone before removing pintle cover.

Keep shims (51) and (56) if possible and use a micrometer to determine each shims thickness. If the yoke pintle bearings are not faulty, the same shims or new shims of the same thickness will be needed to preload the bearings at the time of set up.


If shims (51) or (56) were damaged during disassembly, a yoke bearing preload modification will be vital at assembly. Slide yoke (61) from side to side to release yoke bearing races (59) or (60) within the housing. The races are a normal slip fit but may be tight. Use an open end wrench connecting the yoke and the pintle bear¬ ing to help slide out the races. Use the amount of relevant pressure to bearing (59) or (60) at the approximate center and al¬ low the bearing rollers to gently push the race out of the housing.

Remove yoke (61) from housing (32). Raise front shaft bearing (62) from the housing. DO NOT remove the bearing race unless bearing was found faulty. Refer to Figure 21 for bearing race removal instructions.

Remove retaining ring (63) and push shaft seal (64) out of the housing. Utilize a short piece of 1 ^" heavy wall tubing as a tool or if the yoke was not re¬moved, apply a tar ass rod and work from the inside of the housing to drive shaft seal (64) from the housing.


Every one of the parts ought to be thoroughly cleaned and kept clean during examination and assembly. Clean every one of the detached parts, using a commercial cleaner that is similar in temperament with the system fluid. Compressed air may be used in cleaning, but it is the filtering that will remove the water and contaminates. Clean compressed air is predominantly useful in cleaning valve block pas¬sages.


Restore all parts that do not meet the following requirement: Examine vane pump shaft (17) for wear and chipped splines.

Make sure bearing spacer (37) for burrs. Eliminate small burrs with an India stone. Scrutinize cylinder block face (38) for wear, scratches and/or erosion involving the cylinders. Check the spring, washers and retaining ring removed from inside the cylinder block.

Ensure each cylinder block bore for unnecessary wear. Use the piston and shoe subassemblies (39) for this reason. The piston should be a close fit and glide easily in and out of the bore. No bind can be tol¬ erated. If binding is obvious, clean the cylinder block and piston, oil with clean hydraulic fluid and try once more Even minor contamination of the fluid could be the reason the piston will freeze up in the cylinder bore. Examine both piston and shoe subassembly (39) for a maximum end play of 0. 003 inch between the piston and shoe.

Each shoe of the nine piston and shoe S/A's (39) must be ensured of thickness.It should be within 0. 001 inch of each other. If out of tolerance, restore the whole set of piston and shoe subassemblies simultaneously.

Check shoe plate (40) for too much wear and cracking in the area of spherical washer (41). If serious wear or cracks are found, change the shoe plate and spherical washer at the same time. Make sure spherical washer (41) for burrs, wear and likely scratches due to pin (42) breakage. Re-place if wear is unnecessary. Look over pins (42) for equal length, too much wear and probable bending. Replace all pins simultaneously if one is not working.

The pin retainer (43) might develop burrs; move all burrs with an India stone. Examine the bronze face of wafer plate (35) for to much wear, scratches, and likely fracture. If the wafer plate is cracked, make sure the new plate rests flat next to the valve block at assembly and that wafer plate pin (36) does not level too far and hold the wafer plate away from the valve block. Inspect shaft (48) for broken splines, burrs, and wear in the area of shaft seal (64). Remove burrs with an India stone. Wear in excess of 0. 005 T. I. R. has to have shaft replacement to stop leakage

45 gpm fixed inline piston pump
(M) pfb45-(F)rf-10/11
(M) pfb45 (F) LF 10/11
F6 PFB45(F) 10/11
I-3250 s


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Hydrostatic Transmission Service, LLC

404 Air Park Rd, Tupelo, MS 38801 |

Phone : 662-680-8899

Toll Free : (800) 361-0068