Parker PGP 600 Series User manual

Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
PGP 600 Series Cast Iron Pumps Service Manual

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birth defects, and other reproductive harm. www.p65warnings.ca.gov
Table of Contents
General Information ...........................................................................................................................1-4
Single Pump........................................................................................................................................ 1
Use Genuine Parker Replacement Parts ......................................................................................... 2
Tool List ............................................................................................................................................3-4
Exploded View ....................................................................................................................................... 5
Bill of Materials...................................................................................................................................... 6
Disassembly Instructions ................................................................................................................7-10
Assembly Instructions ...................................................................................................................11-17
Guidelines of Acceptable Wear.....................................................................................................18-19
Fluid Recommendations................................................................................................................20-22
Start-up Procedure / Test Procedure ................................................................................................ 23

WARNING: This product can expose you to chemicals including lead or DEHP which are known to the state of California to cause cancer,
birth defects, and other reproductive harm. www.p65warnings.ca.gov
PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Catalog HY13-PMD600-SM/US
General Information
Single Pump
Cast Iron Housing
Case Hardened Gears
SAE 2 or 4 Bolt
Mounts
SAE Split Flange and ODT Ports
Low Friction Bushing Coating
Balanced Thrust Plates
Minimize Friction & Leakage

2
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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Catalog HY13-PMD600-SM/US
General Information
Use Genuine Parker Replacement Parts
These service instructions will familiarize you with Parker's single and multiple pumps, their component parts, the relative
position of each part proper methods for assembly or disassembly of the units
To facilitate the repair of these units, and before any work is done, we suggest that you rst read all of the steps used in
disassembly and assembly.
Dirt is the enemy of any hydraulic system. The rst requirement of good maintenance of hydraulic equipment is cleanliness.
MAKE SURE YOU DISASSEMBLE AND ASSEMBLE YOUR HYDRAULIC EQUIPMENT IN A CLEAN AREA.
The pictures show Model PGP620. Notes in the text cover variations between this unit and the other models.
It is important to airblast all parts and wipe them with a clean, lintless cloth before assembly.
USE CAUTION IN GRIPPING ALL PARTS IN THE VISE TO AVOID DAMAGING MACHINED SURFACES
A pump must be driven in the direction of rotation for which it was built; otherwise, the pressure will blow the shaft seal.
Check the exploded view and notes at right for proper direction of rotation.
Parker’s Replacement Parts
Parker’s replacement parts are of original equipment standards. For assured quality of material and workmanship, and for
compatibility in assembly, USE ONLY GENUINE PARTS.
Check all replacement parts before installing them to be certain that they were not damaged in shipment.

3
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birth defects, and other reproductive harm. www.p65warnings.ca.gov
Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Tool List
Arbor press Bearing puller (Owatonna Tool Co. M D - 956 or equivalent)
Awl Deburring tool (an old le with cutting teeth ground off)
1-1/2" Dia. steel ball No. 3 non-hardening sealant or equivalent
Clean, lintless cloths Permatex Aviation Form-A-Gasket™
Machinist’s hammer Medium grit carborundurn stone
Soft hammer Scale (1/32" or 1/64" graduations)
Oil and grease Vise with 6" minimum opening
Snap ring pliers Seal removal tool (See A)
Prick punch Bushing installation tool (See B)
Small screw driver Special steel sleeve (See C)
Torque wrench
Bar for lip seal installation:
PGP/PGM610 use 1-5/8" dia. x 2" bar (22mm x 50mm) PGP/PGM640 use 2-1/2" dia. x 2" bar (32mm x 50mm)
PGP/PGM620 use 1-3/4" dia. x 2" bar (24mm x 50mm)
ASeal Removal Tool
Easily made from an old screw driver. Heat the tip and bend as shown. Grind the tip to t the notch behind the shaft
seal.
1/4"
Catalog HY13-PMD600-SM/US
General Information

4
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birth defects, and other reproductive harm. www.p65warnings.ca.gov
Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Catalog HY13-PMD600-SM/US
General Information
Special Steel Sleeve
The special steel sleeve is used to insert the drive shaft through the lip seal without damage and can be made from bar
stock:
PGP/PGM610: Use a 1" dia. x 3-1/4" bar
PGP/PGM620: Use a 1-3/8" dia. x 4-5/8" bar
PGP/PGM640: Use a 1" dia. x 4-5/8" bar
The drawing and chart give details for making this special tool.
Bushing Installation Tool: A.I.S.I 8620 Bearing Quality Steel Heat Treated
Pump/Motor A B C
Radius D Dia. E Dia. F°
Chamfer
PGP/PGM610 1-7/8" 3" 9/16" .870" + .000"
- .002" .610" + .000"
- .002" .015" x 60°
PGP/PGM620 3-9/64" 4-21/64" 9/16" .925" + .000"
- .002" .881" + .000
- .002" .015" x 60°
PGP/PGM640 3-3/8" 4-1/2" 9/16" 1.290" + .000"
- .002" 1.250" + .000"
- .002" .015" x 60°
PGP/PGM620 - Mylar Sleeve Part #8682-133-00G
C
B
Pump/Motor A B C Dia. D Dia.
PGP/PGM610 3.000" .854" .854" +.000"
- .002" 1.250
PGP/PGM620 3.000" 1.092" 1.172" +.000"
- .002" 1.250
PGP/PGM640 3.000" 1.280" 1.280" +.000"
- .002" 1.625
A
.06"
.06"
30°
30°
Grind Relief Allowable
B
C
D
B
A
E
F°
C Radius
1/4" Hole Drill
Through
D

5
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PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Catalog HY13-PMD600-SM/US
Exploded View
8
5
1
710
11
13
3
9
2
12
13
11
10
4
6
14
15

6
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PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Catalog HY13-PMD600-SM/US
Bill of Materials
ITEM DESCRIPTION QUANTITY
1 Shaft End Cover, Flange 1
2 Gear Housing, Body 1
3 Gear Shaft, Drive Gear 1
4 Driven Gear, Idler Gear 1
5 Drive Screw 2
6 Hex Nut 4
7 Name Plate 1
8 Snap Ring 1
9 Stud 4
10 Pump Seal Element 2
11 Pump Seal Energ 2
12 Lip Seal 1
13 Balance Plate 2
14 Washer 4
15 Section Seal 1

7
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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Disassembly Instructions
1) Place the pump in a vise with the drive gear pointing up
(Fig. 1). Match-mark all sections.
Be sure to align these marks when reassembling.
DO NOT GRIP ON OR NEAR ANY MACHINED
SURFACES DURING ASSEMBLY OR DISASSEMBLY.
Start Disassembly
CAUTION:
1. If prying off sections becomes necessary, take extreme care not to mar or damage machined surfaces. Excessive force
while prying can result in misalignment and seriously damage parts.
2. If parts are difcult to t during assembly, tap gently with a soft hammer. (Never use an iron hammer.)
3. Gears are closely matched, therefore they must be kept together as sets, avoid touching gear journals when removed
from a unit. Handle with care to avoid damage to the journals or teeth.
4. Never hammer bushings into bores. Use an arbor press.
2) Remove four bolts and cap screws on single units
or the 4 hex nuts, studs and washers of multiple
units (Fig. 2).
Use a wrench to remove the 4 capscrews on
single units or the 4 hex nuts, studs and washers
of multiple units. The back bolts might need to be
loosened and the shaft end cover slightly lifted to
reach the back nuts all the way removed.
3) Place a seal guide over the seal before removing
the shaft end cover (Fig. 3). This step will help
avoid damaging the seal.
Figure 1
Figure 2
Figure 3

8
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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Disassembly Instructions
4) Lift off the shaft end cover. (Fig. 4). If prying
with screw driver is necessary, be careful not to
damage the machined surfaces.
5) Remove section seal if didn’t come off with the
shaft end cover (Fig. 5).
Replace with new seal. Install snugly back into
bottom of shaft end cover for re-assembly.
Contact an authorized Parker Service Center to
determine and order the proper seal kit for your
pump.
6) Remove the thrust plate (Fig. 6). Examine and
replace if necessary. See Wear Guide (pages
18-19).
Below are some examples of damaged plates
(Fig. 6a, 6b, 6c, 6d).
Figure 4
Figure 5
Figure 6
Figure 6a Figure 6b
Figure 6c Figure 6d

9
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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Disassembly Instructions
9) Next, remove the idler gear while holding down
the bottom thrust plate (Fig. 9).
Keep these gears together because they are a
matched set.
Examine each for wear and replace if
necessary.(See Wear Guide pages 18-19.)
7) Place match marks on gears before removing
(Fig. 7).
This will serve as a reference when reassembling
the motor.
8) Carefully remove drive gear rst (Fig. 8).
Avoid tapping the gear teeth together or against
other hardened surfaces.
10) Carefully remove the thrust plate from the
bottom of body (Fig. 10). Examine and replace if
necessary. (See Wear Guide pages 18-19.)
Figure 7
Figure 8
Figure 9
Figure 10

10
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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Disassembly Instructions
11) Remove the snap ring (Fig. 11).
Snap ring is located in front of the shaft seal ring.
Figure 11
Figure 12
12) Remove the lip seal (Fig. 12).
Be careful not to damage seal bore in pump body.
See tool list on page 3 for prying device.
Figure 13
13) Clean all faces of the body and mounting ange
from sealant and dirt (Fig. 13).

11
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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Assembly Instructions
2) Prep new lip seal for replacement (Fig. 1).
3) Grease new lip seal (Fig. 2). Coat the outer edge
of the lip seal and its recess with non-hardening
sealant or equivalent before replacing.
1) Before start, clean all machined surfaces and make
sure are free of debris.
Start Assembly
4) Replace lip seal (Fig. 3 & 4). With the metal side of
the lip seal up, press it into the mounting ange side
of the shaft end cover with an arbor press and bar
(see Tool List on page 3). Be careful not to damage
the lip of the seal.
Press in until ush with the recess. Wipe off excess
sealant.
Figure 1
Figure 2
Figure 3
Figure 4

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birth defects, and other reproductive harm. www.p65warnings.ca.gov
Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Assembly Instructions
5) Replace bearing (Fig. 5). Place new bearing over lip
seal for installation.
6) Press new bearing over lip seal (Fig. 6 & 7) .
Using arbor press, seat new bearing ush with lip
seal.
Figure 5
Figure 6
Figure 7

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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Assembly Instructions
8) Mount shaft end cover facing down in a vise (Fig. 10).
9) Re-afx or replace section seal (Fig. 11).
Verify both sides of the section seal are free of
debris. If need to replace, grease the new section
seal and insert rmly into the grooves in both
sides of the gear housing.
7) Assemble the snap ring (Fig. 8 & 9) . Using snap ring
pliers, seat new snap ring on top of bearing and lip
seal.
Figure 8
Figure 9
Figure 10
Figure 11

14
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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Assembly Instructions
10) Assemble new sealing parts in pressure plate and verify
orientation.
The sealing parts can be xed with grease. (see below
for steps to install sealing parts correctly)
i. Turn the pressure plates so the seal groove faces up
ii. Place the soft black into the seal groove with the
at side down
iii.Place the hard nylon back-up seal, at side up,
into the groove on top of the rubber seal
Pump Thrust Block - Back Side (Fig. 12a, 12b)
Pump Thrust Block - Front Side (Fig. 12c)
Motor Thrust Block - Back Side (Fig. 12d, 12e)
Motor Thrust Block - Front Side (Fig. 12f)
Figure 12a
Pump Thrust Block - Back Side
Figure 12b
Pump Thrust Block - Back Side
Figure 12c
Pump Thrust Block - Front Side
Figure 12d
Motor Thrust Block - Back Side
Figure 12e
Motor Thrust Block - Back Side
Figure 12f
Motor Thrust Block - Front Side
Figure 12
The proper seal installation is very important. If these seals are assembled upside down, they will most likely fail
in a short period of time under system pressure.

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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Assembly Instructions
11) Assemble the lower thrust block into the motor
body (Fig. 13), using grease if needed on sealing
parts.
Orientation is rotation sensitive for pumps and
the seals should be pointed down and facing the
high pressure side of the pump, the pressure port.
Push down until the thrust block is ush with the
shaft end.
12) Insert drive gear (Fig. 14).
Insert shaft fully until seated rmly at the bottom
of port end cover.
14) Insert upper thrust plate on top of gear set
(Fig. 16).
The plate should be ush with motor body.
Position is rotation sensitive.
.
13) Insert idler gear (Fig. 15).
Gently turn gears until have lined up the match
marks.
.
Figure 13
Figure 14
Figure 15
Figure 16

16
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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
15) Slide a lubricated steel shaft seal sleeve over the
drive gear (Fig. 17).
This will protect the gear while installing the shaft
end cover.
Assembly Instructions
16) Verify section seal is free of debris and rmly on
bottom of shaft end cover. Fit the shaft end cover
careful from the top down to the body (Fig. 18).
Make sure the interlocking track is on correctly
and line up match marks.
17) Thread the fasteners onto the body and tighten
alternately or in an X pattern (Fig. 19).
To correctly insert the back nuts and washers,
hold the shaft end cover up slightly until nuts can
be hand tightened. Then push body down rmly
to tighten front screws.
18) Tighten nuts (Fig. 20).
Begin hand tightening nuts in cross pattern,
then nish with wrench. Torque diagonally
opposed fasteners to correct torque.
Figure 17
Figure 18
Figure 19
Figure 20

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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Assembly Instructions
19) Torque diagonally opposed fasteners to correct
torque. (Fig. 21).
Do not lubricate fastener threads before assembly.
Follow torque guide below.
600 Series Torque Guide
Series Lbs-ft
PGP610/PGM610 43
PGP620/PGM620 70
PGP625/PGM625 70
PGP640/PGM640 103
Figure 21

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Catalog HY13-PMD600-SM/US PGP/PGM 600 Series
Gear Pumps & Motors Service Manual
Guidelines for Acceptable Wear
Gear Housing
Wear in excess of .005" cut-out necessitates replacement of the
gear housing body. Place a straight-edge across bore. If you can
slip a .005" feeler gauge under the straight-edge in the cut-out area,
replace the gear housing body.
Pressure pushes the gears against the housing on the low pressure
side. As the hubs and bushings wear, the cut-out becomes
more pronounced. Excessive cut-out in a short period of time
indicates excessive pressure or oil contamination. If the relief valve
settings are within prescribed limits, check for shock pressures or
tampering. When the cut-out is moderate, 005" or less, the gear
housing body is in good condition and may be reused.
Gears
Any scoring on gear hubs necessitates replacement. Scoring,
grooving, or burring of the outside diameter of the teeth requires
replacement. Nicking, grooving, or fretting of teeth surfaces also
necessitates replacement.
Drive Shafts
Replace if there is any wear detectable by touch in the seal area or
at the drive coupling. The maximum allowable wear is .002".
Wear in the shaft seal area indicates oil contamination. Wear or
damage to splines, keys, or keyways necessitates replacement.
Balance Plates
The balance plates seal the gear section at the sides of the gears.
Wear here will allow internal slippage, that is, oil will bypass within
the pump.
A maximum of .002" wear is allowable. Replace balance plates if
they are scored, eroded or pitted. Check center of thrust plates
where the gears mesh. Erosion here indicates oil contamination.
Pitted balance plates indicate cavitation or oil aeration. Discolored
balance plates indicate overheating, likely due to insufcient oil.