This document is a service and parts manual for the PTH50 series pallet truck. It provides instructions for maintenance, troubleshooting, and replacing parts. The manual describes the hydraulic unit functions for raising, lowering and neutral operations. It also provides details on inspecting and lubricating components, checking fluid levels, and removing and disassembling the hydraulic unit.

1. M
Revision: A • Printed in Germany
SERVICE + PARTS MANUAL
PTH50 SERIES
Order no.: 812570-006
From Serial No. SZ_____ __ on

2. TABLE OF CONTENTS
3
PTH50
TABLE OF CONTENTS
SERVICE PAGE SERIAL NO. CUT REV.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Model Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Lubrication and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hydraulic Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Raise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Neutral . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Lower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Fluid Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Type of Fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hydraulic Unit Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Key to Figure 15295 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Hydraulic Unit Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Lift Piston Ram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Pump Piston . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Cartridge Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Forks Will Not Raise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Unit Will Not Hold Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Unit Lifts On Pump Stroke But Lowers When Handle Is
Raised . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Unit Leaks Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . . . . 9
Unit Will Not Lower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PARTS PAGE SERIAL NO. CUT REV.
Main Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Hydraulic Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Lift Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Load Roller Single . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Load Roller Single . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Load Roller Tandem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Load Roller Tandem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Labels and Decals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3. TABLE OF CONTENTS
4
PTH50
Notes:

4. 1
SERVICE

5. 2
Notes:

6. SERVICE
Introduction
3
PTH50
Introduction
This manual is intended for the service technician.
It includes information about maintenance, trouble-
shooting and a list of replacement parts for the hand
pallet truck PTH50.
Replacement Parts
When ordering replacement parts from this manual, al-
ways specify:
– the part number
– the model number of the truck
– the serial number of the truck
The data plate with model and serial number is located
on the rear of the fork carriage (see Fig. 15292).
Model Number
This number is used as a brief description of the truck.
Refer to the example below for the method used to de-
termine the model number and its meaning.
Lubrication
The truck is designed to require minimum lubrication.
Self-lubricating bushings and sealed bearings are used
throughout the truck with two exceptions:
– A single grease nipple is provided so the bear-
ing in the traverse can occasionally be lubri-
cated (use part number 063002-034).
– The handle lever ball detent needs occasional
lubrication (use part number 363108-001).
15292
1 Image Generator (PTH = Hand Pallet Truck)
2 Fork Spread (in inches)
3 Fork Length (in inches)
4 Capacity* [50 = 2300 kg (5000 lbs)]
*Actual rated capacity may vary, depending on special
equipment or modifications. Refer to the data plate for
actual cpacity rating.
PTH50-27-48
1 2
3
4

7. SERVICE
Lubrication and Inspection
4
PTH50
Lubrication and Inspection
15310
Index Component Inspect / Lubricate
I-1 Handle, Actuating Lever Inspect handle; lubricate handle detent ball area.
I-2 Entry Roller, Load Roll-
ers
Check for cuts.
I-3 Risers Keep risers lubricated. Check for signs of damage or wear.
I-4 Forks Inspect forks for cracks on exterior surface.
I-5 Grease Nipple Ensure bearing is properly lubricated; use part number 063002-034.
I-6 Steered Wheels Inspect wheels for cuts.
I-7 Hydraulic Unit Make sure pump is clean. Inspect for any signs of damage or wear.
I-8 Spring Check spring for wear, damage, and cleanliness.

8. SERVICE
Hydraulic Unit
5
PTH50
Hydraulic Unit
Functions
(Refer to Figures 15295 & 15305EU)
Raise
Raise function is selected by pushing actuating lever
down to raise position (4, Fig. 15305EU).
When the handle is raised, the pump piston is actuated
upward by means of spring (5, Fig. 15295) and draws
fluid from reservoir through control chamber, around
the upper check ball (24) in the cartridge valve, through
chamber (25) and into the pump cylinder. Fluid move-
ment continues in this direction until the top of the han-
dle stroke is reached.
Pushing the handle downward forces fluid out of the
pump cylinder and through the chamber. The upper
check ball (24) in the cartridge valve blocks the control
piston chamber and reservoir. This causes the fluid to
continue past the lower check ball (23) in the cartridge
valve and into lift chamber, moving the lift piston ram
upward. The forks are raised.
When the end of the handle stroke is reached, the han-
dle is raised again and the cycle repeats.
As the handle is raised, the lower check ball in the car-
tridge valve (23) closes, thus retaining fluid in the lift
chamber.
Neutral
Neutral function is selected by engaging actuating le-
ver in neutral position (3, Fig. 15305EU). In this posi-
tion tension is applied to the pull rod and chain. The
chain pulls the connector and rotates the cam shaft
moving the control piston downwards.
The downward movement of the control piston unseats
the upper check ball (24) in the cartridge valve in the
control piston chamber.
Raising the handle draws fluid from reservoir through
control piston chamber around the upper check
ball (24) in the cartridge valve through the control pis-
ton chamber and into the pump cylinder.
When the handle is pushed downwards, since the up-
per check ball in the cartridge valve (24) is held un-
seated, fluid returns to reservoir, by the same route.
Lower
Pulling the actuating lever up to lower position (2,
Fig. 15305EU) lowers the forks. This transmits the
downward movement of upper check ball (24) in the
cartridge valve to the tappet and unseats the lower
check ball (23) in the cartridge valve opening a pas-
sageway and allowing fluid to escape from the lift
chamber, back into the reservoir, thus lowering the lift
piston ram and the forks.
As the actuating lever is released, springs (5 & 22,
Fig. 15305EU) and the spring in the handle return all
components to their previous positions.
Fluid Level
With the forks lowered, check hydraulic fluid by un-
screwing the filler plug. Insert a clean probe.
• Maximum fluid level should be 38 mm (1.5 in) from
top of pump cover.
• Minimum level 57 mm (2.25 in) from top of pump
cover.
15305EU
1 Handle
2 Actuating lever in lower position
3 Actuating lever in neutral position
4 Actuating lever in raise position
1
2
3
4

9. SERVICE
Hydraulic Unit
6
PTH50
Capacity of the hydraulic unit is:
• 46 mL (15.4 US fl oz) minimum
• 58 mL (19.7 US fl oz) maximum
Type of Fluid
When operating in temperatures above freezing, use
Crown anti-wear hydraulic fluid, part number
363504-101, or equal. For units being operated in tem-
peratures below freezing, use Crown low temperature
hydraulic fluid, part number 363505-101, or equal. Do
not use brake fluid.
To obtain maximum life from the hydraulic unit, a mag-
net is located at the base of the ram to attract and hold
any metal particles that could cause damage to seals,
valve seats and other parts. Approximately every three
months, the ram should be removed so that any parti-
cles attracted to the magnet can be cleaned off. The
hydraulic unit must be partially removed to remove the
ram.
Hydraulic Unit Removal
(Refer to page 12)
1. Raise forks completely and securely block rear of
truck approximately 100 mm (4.0 in).
2. Remove roll pin from frame.
3. Drive out roll pin. Remove hub caps & retaining
rings. Remove wheels from axle. Remove retain-
ing ring - not necessary for removal of ram to clean
magnet.
4. Pull actuating lever to lower position, while press-
ing lift piston ram into cylinder. The hydraulic unit
can now be lifted out.
15283
Hydraulic Fluid
Fill/Check Plug
Cartridge Valve
Torque to 50 Nm
(36.8 ft lbs)

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11. SERVICE
Hydraulic Unit
7
PTH50
15295

12. SERVICE
Hydraulic Unit
8
PTH50
Key to Figure 15295
Hydraulic Unit Disassembly
(Refer to Figure 15295)
Lift Piston Ram
Remove by pulling through the top of unit out of cylin-
der. Seal (13) is then removed followed by circlip (14)
which allows removal of the bushing, seal (17) and
spacer. Once the ram is removed, the magnet (19)
should be cleaned.
Pump Piston
Circlip (8) is removed allowing pump cylinder to be re-
moved with O-rings (21), back-up ring, spring (22),
pump piston, washer and retaining ring (14). Seals (13)
and (17) may be removed at this time.
If pump piston and cylinder cannot be easily removed
(due to seals "sticking"), use gentle downward pres-
sure on the handle to push them out. Be careful not to
compress the spring too much since this may cause
the entire assembly to be released in a hazardous
manner.
Cartridge Valve
The cartridge valve controls the lift/lower functions. In-
ternally it has an upper and lower check ball and spring
that controls the flow of hydraulic fluid. Inspect seals on
cartridge valve, if needed, replace all seals on cartridge
valve. Disassemble cap screw from chain connector
and remove chain, link and connector through hole in
handle pin. Drive out roll pin and remove handle pin.
The entire handle assembly can now be removed. Ro-
tate cam shaft so roll pin is parallel to control piston.
Drive out roll pin from cam shaft. Remove control pis-
ton spring and O-ring. Finally, remove cam shaft.
(1) Cartridge Valve
Torque to 50 Nm
(36.8 ft lbs)
(11) Handle Shaft (22) Control Spring
(2) Piston Boss (12) Camshaft (23) Lower Check Ball
(3) Rod Seal (13) Seal (24) Upper Check Ball
(4) Seal (14) Circlip (25) Control Piston
(5) Compression Spring (15) Cylinder Ram (26) Chamber
(6) Washer (16) Pump Casting (27) Handle Roll Pin
(7) Piston Retainer (17) Rod Seal (28) O-Ring
(8) CirClip (18) Ram Piston (29) Wiper
(9) Pump Piston (19) Magnetic End (30) Oil Plug
(10) Camshaft Roll Pin (20) Back Ring (31) Washer
(21) O-Ring (32) Handle Pin