Crown SC4500:
No Hydraulic functions

I'm working on a SC4500, just replaced counter balance valve but have no hydraulic function. Pump is not engaging when you sit on the seat. You can't here the pump contactors click. It is a brand new contactor, also replaced the jumper diode. The pump FU2 200amp fuse is good. Seat switch is good. All fuses checked and found good. Any and all advise is very welcomed.
  • Posted 29 Jul 2020 05:13
  • Discussion started by richard_cucuta
  • Georgia, United States
RichardCucuta
Showing items 1 - 3 of 3 results.
Check pin 7 and 8 for battery negative on CA631. There may be an option for a tilt interlock which may be a factor in the issue if its equipt. Does the BDI (access1) work properly?
  • Posted 31 Jul 2020 03:12
  • Reply by ForkLiftFred
  • New Hampshire, United States
Fix it
The problem was a Bad BDI and a Damaged battery negative wire coming from CA631-07
  • Posted 31 Jul 2020 01:16
  • Reply by richard_cucuta
  • Georgia, United States
RichardCucuta
Could you provide a part number for the part you replaced? Was this the original issue or was this an issue that began after replacing the part? Seat switch is plugged in? Fuse for the circuit is good? Seat switch normally runs steer motor for a few seconds then shuts off, does that run? Does the lift beep at you when you attempt to use the hydraulic levers? Does it travel? Apologies for so many questions trying to get an idea where to start.
  • Posted 30 Jul 2020 23:25
  • Reply by ForkLiftFred
  • New Hampshire, United States
Fix it

Post your Reply

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

Having trouble using the Discussion Forums? Contact us for help.

PREMIUM business

Tailift Material Handling USA Inc
Part of Toyota Industries Group - Leading manufacturer of High-quality machines.
Latest job alerts …
La Vergne, Tennessee, United States
Johnston, IA, United States
La Vergne, Tennessee, United States
Louisville, KY, United States
Upcoming in the editorial calendar
FORKLIFT DAMAGE PREVENTION
Nov 2024
AGV FORKLIFT MANUFACTURERS
Feb 2025
Hangcha CPYD35XW71F
Flesherton, Ontario, Canada
New - Sale
SMV (Konecranes) 33-1200C
Balling, Denmark
Used - Sale
Upcoming industry events …
January 21-23, 2025 - Mauritius, Mauritius
February 13-15, 2025 - Mumbai, India
May 20-22, 2025 - Dubai, United Arab Emirates
Upcoming in the editorial calendar
FORKLIFT DAMAGE PREVENTION
Nov 2024
AGV FORKLIFT MANUFACTURERS
Feb 2025
UN Forklift FD50T-NJB3
HANGZHOU, Zhejiang, China
New - Sale
Toplift Ferrari TFC36-48
Stoney Creek, Ontario, Canada
Used - Sale
USD1
Upcoming industry events …
January 21-23, 2025 - Mauritius, Mauritius
February 13-15, 2025 - Mumbai, India
May 20-22, 2025 - Dubai, United Arab Emirates
Fact of the week
Why are denim jeans traditionally blue? While most natural dyes penetrate the cloth fibres when heated, the indigo dye binds externally to the cloth's threads and doesn't reach the core of the yarn. With each washing some of the dye molecules are stripped away which makes the denim fade as the undyed core appears.